Yes, if that is all one does it is most definitely negative. Critical theory which is the Cultural Marxist theory to criticize what they do not believe to arrive at what they do believe without ever having to examine what they believe. They confuse critical theory for critical thinking. Critical thinking is the practice of challenging what one does believe to test its validity.
Relevant reading -
The Frankfurt School and Critical Theory
I know what critical theory is. I've made two points in this thread
1) atheism is not a critical theory
2) critical theory is not merely negative. There's nothing in your article which declares it as such, but also I think the
Stanford Encyclopedia article is better written, and I'll call out this quote from Horkheimer specifically, who is also discussed by the IEP article:
According to these theorists, a “critical” theory may be distinguished from a “traditional” theory according to a specific practical purpose: a theory is critical to the extent that it seeks human “emancipation from slavery”, acts as a “liberating … influence”, and works “to create a world which satisfies the needs and powers” of human beings (Horkheimer 1972, 246)
Those all involve
positive ends as well as criticism of social structures. Essentially the distinction they were trying to make was that theory shouldn't be separated from practice, and that social theorists also had ethical obligations to try to make the world better. In other words they thought academics should also be activists, which is a position that certainly still exists in the social sciences today.
Probably more important to your OP is just (1). Critical theory is interesting in and of itself but it has basically nothing to do with atheism per se.