H-1B / L-1 are non-immigrant visas, immigrant visas are green cards yes. Pausing green card processing in consulates after (on sketchy legal grounds) forcing folks to not do adjustment of status for getting an immigrant visa inside the country is, indeed, how the admin is trying to get around doing their job the way the INA intends them to.
If you mean the memo earlier this year, it was about tourist visas and similar doing aos in country when they are not dual intent visas, which makes it iffy.
They explicitly said that for h1b and l1 aos wouldn’t be affected as they are dual intent visas.
H-1B is dual intent, isn't it?