Because we aren't living in the 90s or 00s or the 10s anymore. In the new era of college football (transfer portal, roster limits), redshirts are something for just linemen who need to physically mature IMO. You don't worry if a guy can help you 3 years down the road (because chances are he will probably have hit the portal by then), you get him on the field ASAP if he is able.
Coleman is supposedly super athletic (and was talked about as an OLB or DE coming out of HS). If he is that athletic you have to find a way to get him on the field. Could he help on kick coverage or as someone who can come off the edge and rush the punter?
I get that we had to throw him into the fire last year out of necessity, but he was a top 100 recruit at a skill position. Those are guys who should be ready to go day 1.