I maybe wrong about the match staff bit but it seems you are wrong about the captain's armbands.
But there is also this
Rule 4.3 of Fifa’s equipment regulations states: “No item (of playing kit or other clothing or equipment or otherwise) may be worn or used in any controlled area if
Fifa considers that it is dangerous, offensive or indecent, includes political, religious, or personal slogans, statements, or images, or otherwise does not comply in full with the laws of the game.”
Infantino addressed it as well. FIFA provide captain's armbands with certain "approved" messages.