Not in Greek (unless you are dealing with the Greek-speaking Jewish diaspora in Alexandria or Asia Minor), but most definitely in Aramaic. The Targums were in use for quite a while. Even your source acknowledges that the latter parts of the Old Testament (Daniel being the last one) were written in part or entirely in Aramaic.
I also firmly believe that, although some of the Jews may not have spoken Hebrew the learned and religious ones certainly were fluent in it. Paul included
No doubt about that. It's like saying that some people schooled in religious studies have mastered Latin, Greek or Hebrew, but the same cannot be said of the general population.
I still don't understand what the point is that Jesus read the verses in Hebrew. Jews read the verses in Hebrew (transliterated) even if they don't understand them.
My point was that in order to explain the verses he had to re-read them or comment on them in Aramaic, i.e. based on Targum, which is to say an expanded translation.
And my point was that in Jesus' day (1st. century) they had the OT in Hebrew (it was NOT the LXX). I wanted to show that it had not disappeared prior to that.