You should have been allowed entry by virtue of your BA OWE as per the entry on the Oneworld Lounge Finder: https://www.oneworld.com/airport-lou...#access-policy.

Not quite sure what you mean if the BA lounge is the same as pre covid at SFO. But there is still a BA lounge in the same location as before in SFO but as GGL you’ll have access to First Dining now (a post Covid improvement).