Elsewhere you wrote
Assuming that there is only one reality and every form of language and concept humans have developed refers to some perception/experience of reality,...
Unfortunately that example of your naive realist assumptions tends to disqualify you as a serious contributor to ontological 'discussions' (ie. those concened with 'existence' as raised by the OP). This should eliminate your need to 'guess' about my refusal to engage.
First, you bringing this into this thread from another thread is hijacking the thread to argue over a paradigmatic issue.
Second, if you think believing in multiple realities is par for the course in discussing time, then you are in your own reality with that and there's no point trying to reach you in that reality.
You can take whatever you want seriously in your reality, then, but it will have nothing to do with what is worth taking seriously in anyone else's reality, i.e. because yours is separate, at least in your own mind/beliefs.