I don't see what's unsympathetic about hoping he manages a bit of rest & relaxation away from the stresses of his office at what could be a very difficult time for him personally and no idea where the quoted part of your post came from, even at the best of times I don't think anyone expects that a Starmer holiday would look like that.
Clearly he's made the decision to go on a break after a short pause for his brother and I don't blame him one bit, we had a short Highlands holiday booked that ended up being about a week after my father died, my mum insisted we still go on it and it turned out to be a great idea as I was able to find a bit of peace rather than have friends & colleagues fussing all over me.