I suppose in English it's : Both of THEM are eating (not both of THESE) Thank you!

'Both are eating' also gives the same meaning and should be accepted.

ये and वे are both used for "they," and "ये दोनों"/"वे दोनों" is "the two of them," "both of them." "These" doesn't work: it sounds like you're about to insult them. "Both of these what? These... pigs??"

A better English translation, as others note, is "Both of them are eating."

English is not right