30 inch tires

Possibly dumb question because it's been awhile since I bought tires for a vehicle, and Amazon and the tire shops keep insisting that these tires Yokohama 30X9.50R15 104S C/6 YOKOHAMA GEOLANDER A/T G015 OWL won't fit my Jeep, even when I put in that it came with 30x9.50 tires from the...