I had a 2015 MacBook Air that became rendered useless this past week when I realized I could no longer access key websites because my browser was outdated, and despite trying to get support from apple and try some "hacks" to upgrade the OS, I couldn't figure it out (was still running Sierra 10.12). I'm not all that upset about getting a new one as I had that last one for 7 years, and I'm really not too techy, so I don't have the time/patience to deal with trying to fix it.
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Anyhow, I bought the 2022 MacBook Air M2 from Costco today. Got it set up and charged up to 75%. I saw on YT that it's recommended to DL the "Battery health" app, so I did. It says my battery health is only 2%. It seems to be performing just fine so far and holding a charge well, but just wondering if I need to be worried about this supposed "battery health" or not.
The only battery health number you should trust is the one reported by macOS.
It sounds like you downloaded a buggy app which some YouTuber was paid to promote.