Texas law forbids abortion even in case of rape/incest. However, per Gallup (your link) 77% of the people think it should be legal for rape/incest.
Currently under Texas law/lack of a stay by SCOTUS which was praised by the CEO, as I mentioned in the previous post, medication abortion via RU-486 would still be available for a woman in this circumstance, although Texas is working to ban it too - this was not discussed in the tweet at issue.
You’re absolutely right about the poll numbers generally being in favor of those 2 exceptions.