Bolt Food is on the showcase page, not Bolt itself, which would be odd not to add both if indeed they were both RN, so seems like one is RN and the other is not, which is basically what the above commenter was saying initially. None of what you said really invalidates their point, because again if you search for RN jobs for Bolt, why would you not also assume it's for the one on the showcase, ie, Bolt Food? Bolt is the company name after all, not just the app name.
You were right. After your comment, I went back to my friend at Bolt and asked again. Bolt Food is on RN, Bolt is native. The conversation we had about Flutter back then was about his other project and not Bolt Food.
I don't know what to say but you're massively mistaken.
Uber use React Native too BTW. Lots of other big tech companies also, I don't know of any that use Flutter in a big way. Just some toe dipping