Unlinking outlet from the switch
This is easy

Fortunately, it appears that always-hot is present at the receptacle location in your case, so fixing the daftness the prior installers pulled (NEC 404.14(E) prohibits dimming general-purpose receptacles if nothing else does, for reasons that range from mere flickery lights to appliances that express their displeasure at being dimmed by getting rather...hot under the collar) is no great challenge for you.

Simply remove all the wires from the receptacle, attach a white pigtail (12AWG stranded THHN always works for pigtails in general wiring if you don't know what to get) to the existing white wires with a suitable wirenut, use another wirenut to attach the black and red wires that went to the receptacle together, undo the taped splice of the two black wires, use another wirenut and a black pigtail to pigtail off of that, and wire up the receptacle with the black pigtail on a brass screw, the white pigtail on a silver screw, and the bare ground pigtail on the green screw.  Button everything back up, turn the power back on, and enjoy your now not-so-dim receptacle!