Why would lack of taste in graphic design be even remotely related to lack of taste in food preparation?

It's like arguing you wouldn't trust a lawyer with a medical negligence case if they can't suture a wound.

Or you wouldn't trust a graphic designer with a restaurant logo if they can't make good scrambled eggs.

This is assuming that the owner is also the chef, and exclusively concerned with cooking. Being a restaurateur is a multi-disciplinary job. The owner's job is literally to have good taste in all areas of the restaurant business: food, interior design, hospitality, branding and marketing, etc. No one is saying that they have to be a graphic designer. The obvious answer here was to have the good sense to hire a local college art student for like $300 to make an endearing and meaningful logo.

Do people even expect anything from “sports” grill?