It’s one thing to say that a country not spending even 2% of the GDP should not be able to call Article 5. It’s another thing to say you would “encourage [Russia] to do whatever they wanted to do” with said country.
Nevertheless it’s signaling unreliability, because it would violate the treaty the US has signed. Plenty of NATO countries have helped out the US when they called article 5 on bullshit arguments and lies when invading Afghanistan.
But you’re right. It’s good European countries rethink their dependence. Too bad it comes with rethinking their alliances as well, with a belligerent USA.