In what way? It's a bunch of semantics really?
1. The U.S. budget defense makes up 72% of all of the Nato countries combined.
2. There is one common fund that all countries contribute to which has $2.5 billion witch basically keeps some offices open.
3. The U.S. pays 1/3 of that common cost at $550 million
4. The U.S. being the world police contributes the majority of global military spending globally when compared to those other Nato countries.
Like I sad it's semantics take Trumps post how you want, but it can be right or wrong and your source politifact (which has a tendency to be left wing bias) even states that.
"Trump’s statement contains just an element of truth, ignoring critical facts that would give a different impression"