Anyone familiar with 4chan knows that some of the earliest content that was banned on the platform include childporn and organizing raids/doxxing. If you read the terms of service, you'll see that content is still banned (even if not uniformly enforced).
The fact that parler couldn't muster even 4chan levels of moderation shows you that they really had no comprehension of the content creators they would be courting with their service.
You can read the comments on any given CNN article, and see racist statements. Should CNN reporters be barred from attending press conferences?
See court filings - https://www.courtlistener.com/recap/gov.uscourts.wawd.294664...
Or for specific sections, see https://twitter.com/questauthority/status/134916216569825280...
Why not? It's not like Valve owns the computers of their customers. They're in clear violation of the Windows terms of service. If you violate the ToS, then Microsoft has every right to remove you from their operating system and Valve is in turn free to migrate to a different OS.
So, it's not "factually false". At best, it's up for a court of law to decide who is telling the truth.
But considering that it's trivial to show messages from Lin Wood, among others at the capital protests messages on parler calling for "appeals to violence" exactly in contradiction to your suggestion that there isn't... Well your argument doesn't appear supported by the facts.
Lin Wood, the president's election lawyer LITERALLY called for VP Pence to be executed the week before the riot. This was shared everywhere on the internet, was shared right there on Parler like tens of thousands of times, and AFAIK was still up and unmoderated when the site was shut down.
Parler's moderation was a community-run thing. Effectively, popular users could say anything they liked.
There was no meaningful moderation at all.
 Or whatever. The relationships were totally muddled, but nonetheless this guy was a big thought leader among the Kraken set.