Modern Greek speakers can NOT understand ancient Greek. And modern Hebrew is NOT mutually intelligible with Aramaic. The OP is correct and the two responses are nonsense. Also, in the 1500s when the Bible was translated to English, very few Europeans spoke Latin and if they did it was a very different Latin from the translations from the Roman era (pre 500 or so). Languages change over time and the Latin spoken by the aristocrats in the 1500s was very very different from the Latin spoken by the Romans.

Virtually none of the Bible was written in a currently-dead language. Only small bits were written in Aramaic, and Koine Greek and Biblical Hebrew are pretty much comprehensible to modern Greek and Hebrew speakers.

Even the Christian era of the Bible being distributed in Latin made perfect sense since it was originally mostly being distributed to people who spoke Latin with questionable accents (and where Latin was the language everyone who was literate was literate in).