"So it is at the bottom of the sea, where the ELT transmissions can't be seen.
But the reality is that it could be anywhere in a radius of well over 1,000 miles."
So even if the Elt beacon is out of range, the emergency locator beacon that is usually with CVR/FDR will have/should deploy and be visible to those scanning the known frequency up to 6000m deep. I gave full details and links yesterday. Or course the signal won't radiate from 10km asl though.
I also caution people to read carefully Official statements with modifiers such as may. One word can give a lot of wriggle room and convey different meanings,