Visited last night and charged Tesla without any issue.
It's probably already been added for a while, but there are a lot more signs and new CCTV since my original visit a few years back.
The signage was never reflected to update the opening to non-Teslas. If you want to respect every sign, you can charge your non-Tesla, but you can't park it here and you cannot enter the lounge... 🤷♂️ Since the code for the lounge is visible in the app for non-Teslas I assume they just couldn't be bothered to make new signs. There's no indication on location that you can charge other cars, so no indication that ad-hoc is available either.
There's a self-serve Model Y test drive near the entrance.