Since this a rather recent event, there are no news articles with claims agreeing or disagreeing on what Nancy Pelosi has said. The video posted with "evidence" has a lot of busy noise making it hard to determine what actually has been said.
Paul D. Thacker, the person whose tweet is linked, is an investigative journalist based in Spain according to his own website. He has a history of writing scientific ethics for numerous news sites such as New York Times, Los Angeles Times, Washington Post, and others. He founded The Disinformation Chronicle, which goals is similar to News Detective, but focuses on scientific based information.
Halal Flow, the account that was quoted by Thacker, is supposedly a politics and news sharing organization. The only information I could find about them is through their Twitter account. There is a link in their description to a Patreon where subscribers can financially support the account. Looking through their tweets, a lot of their content are clips and videos from other news sources. I do not know if they modify/cut any videos to mislead people or if they simply repost them.
Although Tracker seems to be credible, Halal Flow is questionable as a source. And since no other news sites or organizations have made any claims about the original statement, there is no way to confirm or counter the claim.