Yes, in that the Democrats were no longer able to ignore and marginalize their own MAGA faction. They demanded to be heard, their genocidal demands in full view of the world. It will be harder for Biden to win with them actively trying to defeat him from within, but if he pulls it off, the party will be stronger.
I don't buy that this is the reason why he's struggling in the polls, though. The border and economic "vibes" probably have more to do with it.
The economic vibes have gotten better since early 2023 when Biden was polling well against Trump.
The actual economy is getting worse.