Nope, but I did get as far as looking at the actual Javascript that determines which options are listed when you click the 'New style' drop-down menu (on the Custom Form Styles page). Basically if the import style feature is enabled on your account yet, then that's still where you'll find it.

But if the feature is not enabled, you only see the three basic choices for 'Invoice', 'Estimate', and 'Sales receipt'.

My guess is that the other guy who posted a few weeks back about suddenly finding it again technically used the import style feature prior to the June 2021 sunset date, but it might have somehow been turned off on their account temporarily due to a technical error (or the code wasn't working right for awhile, who knows). But it literally comes down to one or two account settings that - as long as they pull up as 'true' when the code is parsed - then the import styles feature is fully accessible.

It's a sad joke, honestly. When many of us are paying over $1k annually for this thing, I don't think it's a very tall ask for them to re-enable a feature that can be rather critical for some of us, especially considering that the code for it literally already exists on the website. And then, maybe 10 years from now when they finally get around to fixing their own template system and it's actually on par with the old one, then they can remove it again.