Short answer, no way to know.
Long answer: elo inflation isnt uniform.
If there is an influx of players who soon become the current 1200 elo, then they ‘push down’ the current 1100 and lower players and also ‘push ip’ the players above them.
Regarding your or anyone’s skills, with time you know how to react better etc etc.
I used to be 950 elo with 30-40 APM.
Now I am 1100 with 20-30 APM.
It’s just that I am able to decide what’s important and what’s not better than my 2020 self.
Viper isn’t better by 400 elo though, he just is better than lots more players in 2023 than 2020.
At your level, 1400, you have probably gotten better, or there has been a huge influx of players of about 800-1000 elo level which caused your elo to inflate.
No way to know.