I'm not. Let me try again in really short sentences. I'll bullet point it for you.
1) 1982 is cited as the worst inflationary period in modern history. It used a certain methodology to measure inflation.
2) 2021 is cited as about 2/3rds as high of a single year inflation using a different method, a revised CPI.
3) IF - IF - we used the same CPI/method as we did in 1982, 2021 would be higher.
Conclusion - the reason we don't think inflation is higher in 2021 is because the (always) imperfect set of assumptions used to estimate it changed.
NO ONE is saying one is better or worse than the other - he's saying if we want to compare apples to apples using the same exact metrics then 2021 is higher than 1982.