Unfortunately Project Veritas goes further than just trying to challege their subjects and instead manufactures their own 'truth' out of manipulated b-roll. Sourced document of some of the claims they've manufactured: https://www.aft.org/sites/default/files/media/2018/projectve...
My greater point is that any media entity's work only conceivably presents a barrier to accurately understanding the world if you don't understand that they have a point of point of view they advocate for.
If you know that ProjectVeritas has a point of view that they advocate for and lean towards one side of the political aisle or the other, then you can take that information into account when gauging the accuracy of their stories and the likelihood that they're not presenting the facts accurately. ProjectVeritas presents no danger to the world even if their stories are always 100% wrong precisely because their bias is well-known and understood; and the visceral reaction to them here very clearly indicates that their bias is well-known.
The real risk comes when a media entity claims to be objective and unbiased when this should be understood to be impossible: no human being has zero bias.
