Yes, for sure, but the way Biden’s mental fitness was poor-pooed as misinformation for years and then Harris was installed at the last minute really undermines the “we’re the party of democracy” narrative.
If his VP was 2nd or 3rd place in the 2020 primaries, it wouldn't be a big deal compared to Harris because the candidate would be someone that a significant portion of the Dems actually support and want as a president.