What exactly is the criticism here? He didn't strand himself in a particular densely populated foreign country while COVID lockdowns were happening across the world? He would be a better friend to India if he stayed there, contracted COVID, and put more strain on their healthcare system to the detriment of actual citizens?
His words, in the context of Indian, Britishness, colonialism, his own writing and the suffering of those he had left behind - he himself apologised for the message "being tone deaf & reeking with privilege" and I think it was quite reasonable that people were irritated by his posts of palm trees and sunny beaches while so few others had the choice.
And secondly, he lives there, it was not a "foreign" country and he was not "stranded". He lives there.