Freedom House receives most of its funding from the US government.
https://en.wikipedia.org/wiki/Freedom_House
> Freedom House is a nonprofit organization based in Washington, D.C. It is best known for political advocacy surrounding issues of democracy, political freedom, and human rights.[3] Freedom House was founded in October 1941, with Wendell Willkie and Eleanor Roosevelt serving as its first honorary chairpersons. Most of the organization's funding comes from the U.S. State Department[4] and other government grants. It also receives funds from various semi-public and private foundations, as well as individual contributions.
I have no reason to trust a random Washington D.C. NGO that gets much of its funding from the US State Department. I do not think that their methodology for judging whether the world is becoming more or less free aligns with freedoms that I care about.
Like the Tor Project, Signal, Tails, Qubes, Wireguard, etc. The US government is not a monolith. Funded by the FBI as a Honeypot phone company is quite different to funded by the Open Technology Fund. I don't see a problem with the Freedom House, they seem critical of the US's problems and are documenting authoritarianism.
On the other hand, I looked at some of their rankings of specific countries and I noticed they put the UK as higher than USA for freedom on the net and in general. That ranking seems odd to me.