Should you blindly trust the advice of trainers, mentors, coaches?

According to the trainer, advice such as “advice for today” (JacaCoach) is only supposed to make you think. It is supposed to light a red or green light – what I might be doing wrong, or what I am doing very well.
Ultimately, everyone is responsible for themselves, for their own body.
Any advice from a third party can be stretched and overinterpreted in such a way (usually for your own convenience, benefit) that something completely opposite can come out of good advice.
And not so extreme, because it is often encountered: you can also look for advice from different people, the ones that will suit you best – it is a matter of choosing who is worth trusting.