Perhaps tomorrow's stats (when April is added to the monthly statistics) will be different, but the automatch stats from March do not indicate any real resurgence of Osttruppen in 1v1. The commander not even in the top 10 most picked. Top 200 players.
Looking at the weekly stats for April, Osttruppen are in the exact same position (11 on popularity).
https://coh2stats.com/stats/month/1614556800/1v1/wermacht?statsSource=top200
I have no interest or stake in Osttruppen as a teamgames player, but based on these and the ML stats I'd say it would probably be best to just revert all the buffs in the preview just to be sure but not nerf them either, and just see how they'll do in the upcoming weeks.
Stop using popularity as a metric of anything.
Also it’s been a month and still no Osttruppen nerfs in the preview mods. This joke has to end eventually.