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Concerns Raised Over Bitwarden Moving Further Away From Open-Source
(www.phoronix.com)
This is a most excellent place for technology news and articles.
The SDK was never FOSS, and was never under the GPL. Hence why they can add the text mentioned in the article. You don't get to change the text of a FOSS license to begin with. It isn't unheard of for text like this to be part of proprietary software that integrates with and uses FOSS that are under different licenses.
That said, this is concerning, but whether it changes BW's FOSS state is a matter of legal bickering that has been going on for decades.
You can’t retroactively change FOSS licensing, but oft times you can alter the licensing moving forward. Not always the case, of course. But in no way are all FOSS licenses set in stone.