Unequivocally yes. It is a philosophical question. There are different types of philosophical questions, however. One category is the questions that philosophers ask, and the other are technical questions about philosophy.
For instance, questions that philosophers ask:
- How does one achieve eudaimonia?
- What is the meaning of life?
- What is a meaningful philosophical question?
Note that these questions are philosophical in that they don't have pat technical answers, but rather depend on one's metaphysics. They are what might be called metaphysically speculative questions, and have been asked by world-famous philosophers and theologians. For instance, the Ancient Greeks were preoccupied with eudaimonia. The question of the meaning of life has been tackled more recently by existentialists and the absurdist Camus. And the currently emerging field of metaphilosophy is preoccupied with answering the last question. Thus, these are philosophical questions beyond any doubt.
But there is a second set of questions about what might be termed the philosophical canon. For instance:
- What was Rene Descartes saying about introspection in Meditations*?
- What were Carnap's views on ontology?
- How does Lewis justify modal realism in his book on the subject?
These questions are factual and not metaphysically speculative in nature. On our site, we differentiate between questions that philosophers ask, and questions about philosophers and their philosophy. A meta post on this site purports to restrict discourse to the latter category here. (Given the mechanisms in place to regulate content, it is not strictly observed.)
I would suggest that the ██████ channel observes a similar dichotomy (and may do a better job at regulating than we do here). So, it's not a question of whether your question is "philosophical enough", but more a question of is your question a factual question about the philosophical canon, or is it speculative and doing philosophy rather than merely discussing it?
Hence, don't be put out if you were rejected based on such a criterion. It helps to sort out intelligent discussion from philosophy to metaphysical speculation by people untrained in philosophy, and that is likely the policy of the site in question.