There seems to be a few issues that have not been addressed. Firstly, what exactly IS a chumra? When is one allowed to be machmir, and when is it assur to be machmir?
What does when do when he does not have a rov to consult for psak?
And lastly, how can Reb Moshe Zatzuk”l say that Cholov Stam is halachically permitted – i.e. 100% ok, while simultaneously recommending that a baal nefesh be machmir?
I’ll leave it to my fellow CR members to address these issues.