These questions of rating inflation/deflation over time are very tricky to answer objectively. It is very easy to find mid-range players who will say something like "My rating today is about 200 points lower than it was 10 years ago but I'm just as strong if not stronger [spot the wishful thinking] therefore there must have been rating deflation at my level during this period". Full disclosure: I'm one of those mid range players :-)
To get more objective views (I think definitive answers are another, more complicated, matter) you have to look at how many players were above a given level today and 10 years ago and perhaps also the percentage of players who were above a given level today and 10 years ago.
That data is available via the FIDE rating website where it is possible to download rating data going back to 2001.
Here are the figures from the January 2019 and January 2009 lists:
Players rated above 2650 = 109 (0.0335%)
Players rated above 2100 = 40940 (12.6%)
Players rated above 1500 = 224873 (69.1%)
Total rated players = 325306
Players rated above 2650 = 75 (0.0756%)
Players rated above 2100 = 40044 (40.35%)
Players rated above 1500 = 98669 (99.4%)
Total rated players = 99232
Interpreting these figures is difficult, particularly the percentage ones.
If you just look at absolute values then there are a lot more players graded over 2650 today than 10 years ago and the same for players rated over 1500. This suggests rating inflation at both levels. I've also included values for players over 2100 because, intriguingly, these are almost unchanged.
If you look at percentage values then a much smaller percentage of players are rated over 2650 today than 10 years ago and the same for players rated over 1500. This would suggest a great deal of rating deflation at both 1500 and 2650 levels. The deflation is highest, however, at the 2100 level (out of the three levels I have looked at).
However, I think the percentage values are problematic. First if you look at the 1500 level 10 years ago there are only 563 players with ratings <= 1500. I suspect that this is because the only FIDE rated tournaments for players below 1500 were tournaments like continental and world junior tournaments going down to levels as low as 1001.
By the way, the first player I can find to have had a rating just above 1500 was the Polish player Sebastian Kobus. His first rating was 1500 in January 2006. For 1000 it was Indian player Hakeem Nikhil with a rating of 1003 in September 2012. The first sub 1300 player was French player Michel Khechab with a rating of 1260 in September 2009.
There were, of course, a lot of players playing tournament chess whose strength was below 1500 but they were all playing nationally graded chess because there simply were no FIDE rated tournaments for players that weak outside the big FIDE championship tournaments. Those figures show that today over 30% of players have a FIDE rating of 1500 or below compared to just 0.6% 10 years ago.
My tentative conclusion is that there has been some rating inflation at the level of 2650 and above because there has been a 45% increase in the number of players rated over 2650 which I think cannot be accounted for by increasing number of chess players.
I think there has been a lot of deflation in higher mid-ranges (typified by the 2100 figures) because there has been some increase in chess playing numbers which is not reflected in higher numbers at these levels.
At the lower mid-range (1500) I think the data is unreliable 10 years ago due to the very small number of tournaments open to players of these levels and so it isn't possible to draw any conclusions about this level.
Regarding the data for players at the 2100 and 2650 levels I think this is reliable because I think FIDE rated tournaments were capturing most players at these levels.