I open this question because the discussion on @Demigan's question did not come to a satisfactory conclusion.
One of the best discussions on tachyon relativity that I’ve seen is by David Bohm in his book The Special Theory of Relativity, New York, 1965. It is available for download here: https://epdf.pub/queue/special-theory-of-relativity4ba0cc5d0dc7aacebe7c1737a434f84e37001.html
He writes in chapter 28 - The Question of Causality and the Maximum Speed of Propagation of Signals in Relativity Theory
“When two events are in each other’s absolute elsewhere, so that they can have no physical contact, it makes no difference whether we say they are before or after each other. Their relative time order has a purely conventional character, in the sense that one can ascribe any such order that is convenient, as long as one applies his conventions in a consistent manner”.
Is there more to it, or is this still the standard relativistic view? I attach his Fig. 27-2, if it will show in the post.