The 'proofs' tag is not allowed.
Use proof-writing if you'd like advice on the presentation of your proof, or proof-verification if you'd like feedback on its validity.
Otherwise, simply tag the question according to the area of mathematics that it concerns.
Plainly it is not true that all questions about proofs are ask for advice on writing proofs or verification of proofs. We have proof-explanation, which is "for explanation and clarification of some steps of a particular proof" and proof-theory, which is about "proof[s] as formal mathematical objects".
None of the above fits for this question.
That all questions about proofs fit within what is quoted above, so that the word "Otherwise" is appropriate, is exaggerated.
I have created the understanding-proofs tag. Is there a better way to do this?