This question is from my perspective, a perfectly reasonable one.
The OP does not appear to be asking about a particular product or where to buy, but rather if a source of supply they have found (which claims component performance that does not seem reasonable) is truly legitimate (we think the answer is no).
To answer this question needs quite a lot of experience and is a question I would encourage as it illuminates the somewhat shadier side of the electronics supply chain which is definitely a subject that falls within the remit of valid questions from my perspective.
Based on Dim's comment, if a simple word like 'price' is mentioned and causes a closure, we could do it with a bot; I would expect mods to exercise a bit of critical thinking on this.