Talk about missing the point.
@TonyColemansbagofapples is just correctly pointing out that your injury woes are nowhere near as bad as you lot are making out. He didn't say that every player should be interchangeable, he pointed out that you haven't had that many first choice players unavailable at any one time and that you chose to play two first choice players at centre back. Your choice. To patronise him for it in the way that you have is ridiculous.
Van Dijk and Gomez have been injured for ages. Yet you waited until the last day of the transfer window to bring in 2 bargain bucket centre halves that you don't trust enough to actually play. That is nobody's fault but your own. Everybody knows that there is generally no value in the January window but are you telling me that your presumably extensive scouting system (or rather our database), and the footballing knowledge and contacts of your manager, could not find 2 better (or more game ready) centre halves than them? If I were you I'd be reserving my ire for your board's woeful mishandling of this situation not at someone throwing a few statistics at you.