Meta analysis shows an average of 0.68%[1], slowly decreasing as treatments get more effective.

[1] https://www.sciencedirect.com/science/article/pii/S120197122...

It’s about 0.6% COVID versus 0.1% seasonal influenza in the US. However, note that the latter figure is the IFR for the “typical” flu. The sentence quoted notes “all other flu-like viruses” - of which there are varieties that are less and more dangerous. Given that qualifier, the quoted sentence doesn’t seem obviously false to me.

I haven't seen anything credible (with supporting studies) saying as high as 1% since March.

It's probably below .4% Depends on the population age. But probably reasonably below .4%

"Across 51 locations, the median COVID-19 infection fatality rate was 0.27%" https://www.who.int/bulletin/online_first/BLT.20.265892.pdf

I suspect it will continue to drop. It seems to hit those it harms the most first and spreads quickly with them. Plus medical is getting better.