Isn't that a work visa and not an immigrant visa
There are employment-based nonimmigrant visas like H1B and L1. Being a nonimmigrant visa means it doesn’t grant you a right to immigrate but some (including H1B and L1) are ‘dual intent’ visas meaning you can apply for an immigrant visa while in the US as a nonimmigrant.
There are employment-based immigrant visas, which have categories like EB1, EB2. Like all immigrant visas these are also known as ‘legal permanent residency’, LPR, or ‘green cards’.
There are also non-employment-based visas that are both nonimmigrant (eg visitor visas, student visas) and immigrant (eg family based green cards)
They explicitly said that for h1b and l1 aos wouldn’t be affected as they are dual intent visas.