Of all the "revelations" of the Twitter Files (mostly recapping the interactions that were already publicly known), preventing DoD run accounts from being marked as spam is the closest thing to an actual scandal. But

1. These accounts weren't promoted, they were just protected from being "deranked".

2. Twitter and Meta suspended most of these accounts, and made public that they had done so. https://www.nytimes.com/2022/09/19/us/politics/pentagon-soci...

So the entirely of this "scandal" is that Twitter agreed to shield these accounts from being attacked themselves (mass labeled as spam) - which as it turns out wasn't needed because according to their own records, these accounts received 1-2 impressions per post. In other words, no one even saw them.

Then Twitter banned them and pubicaly fingered them.

Should Twitter have done this? No. Is it proof of an engine of Twitter/US Gov cooperation to promote certain things and silence others? No.