Well of course OpenAI and Anthropic say those sorts of things, it's what they've always said, particularly Anthropic, but that doesn't necessarily mean that's the position of the US government. In other words the government seems to be listening to some but not all of the lobbying done by the big two.
The guy who said those things just joined OpenAI in the last month. He was previously a senior policy advisor, specifically on AI, to the current administration in the White House.
I don't know that the US government has a unified position on open source AI. But it's not like this isn't a discussion happening among policymakers.