"What was in the victim's mind at the time of the act, not before or after, is central to the inquiry. Any text message that doesn't address that act directly is irrelevant."

In the very recent past we have:
-the Zuker case -where the judge ignored prior texts where the girl said she was willing and looking forward explicitly to intercourse. and
-the Ghomeshi case - where multiple witnesses kept coming up with excuses for why romantically pursuing their alleged attacker after the fact was moot.

So if we exclude contrary evidence before and ignore contrary evidence after the fact, the only thing we are left with is "at the moment"... now I may not be a millenial but pretty sure nobody is texting DURING the act itself.  So in effect, you're saying no evidence which supports the accused should be allowed.