Will Kitchen Backsplash Update Trigger 2ft/4ft Rules of Receptacles above Countertop?
Even though you are replacing a backsplash you are not really remodeling or upgrading your electrical. I can't speak for every inspector but most would say it is alright to leave your receptacles as is under the grandfather clause. 

One important note, even though you are being allowed to leave the receptacles in place I would recommend you add GFCI protection if it is not present, and it may be a required upgrade by your inspector. Since removing existing receptacle is a modification.