Here is the link to the entire plagiarism video by HBomberGuy. The specific timestamp of when the Youtuber formerly known as WAMO was mentioned being sloppy and dishonest with referencing is between 1:22:28 and 1:23:24.

If people don't know who WAMO was, he was a TF2 Youtuber that made a lot of videos emphasising drama in the TFTuber sphere. I think generally people felt that his impact as a Youtuber was overall quite negative.

As a basic summary of the situation described in the Youtube clip, HBomberGuy uploaded a video calling out another Youtuber, illuminaughti, for directly copying a documentary by Brian Deers exposing the MMR Vaccine scandal. It appears that the Youtuber formerly known as WAMO has taken that clip from not just HBomberGuy but other drama Youtubers, and have even misspelled the drama Youtuber's name he was quoting from.

I'm posting this here because I'm sure from my experience of previous discussions regarding WAMO that large sects of the TF2 community will be happy with him leaving, so it is a bit of a schadenfreude moment to see him called out for this behaviour.

I'm glad that the TF2 community has other Youtubers which are much more of a positive and insightful contribution to the community than WAMO previously was, and they make the content that entertains us all about the game we all appreciate.