They might be exaggerating a bit the amount of work to recover it immediately, but resetting a tag to a commit in the reflog might be considered at least a mino

They might be exaggerating a bit the amount of work to recover it immediately, but resetting a tag to a commit in the reflog might be considered at least a minor git surgery. And that’s assuming no public pushes have been made. Then all bets are off and it’s surgery’s time.