Correct. This is NOT about Biden districts.
I carefully counted only 8 seats of that 25 that had a margin of victory under 5%.
17 of those are safe seats.
Take a look at Rep. Tony Gonzales (I picked it at random), for example:
His district is majority Latino. He stomped his opponent in 2022(!), but won by far less, 4 points, in 2020. Trump won the district by 1.8 points, but all the "raters" on Ballotpedia show the district as "lean Democratic" (2 ratings) or "tilt Democratic" (1 rating).
Also take a look at his votes on many different issues, look at other contests within the district, etc. (Yes, this takes time.)
Conclusion: This should be a safe seat in 2024 because Gonzales is a moderate who lines up well with his district. There's literally nothing on the district level to indicate a deep red (or recently became associated with deep red) candidate can win that district.
I've lived in a "moderate" district myself for many years, and while the details are quite different (and probably more typical), it is very very difficult for a deep red House candidate to win here.
If you persist in indulging fantasies of hordes of deep red voters in moderate districts*, that's up to you. It's not a good way to fix fundamental problems, however.
Now, likely some of the 25 districts are after detailed analysis deep red but elect moderates. Please list some, including serious analysis. I agree those need "attention", but, how do we whittle those 25 (or more) down to 3?