Is it true that, if the Chinese air force is deployed to Hawaii, then the US mainland of be within range of?

From Hawaii to the west coast it's about 2200 miles. The J-10 isn't going to cut it, even with air refueling. The KJ-2000 could make it there, but it won't make it back, it's an unarmed AWACs aircraft. If the estimates are correct J-20 can barely make it with one refueling on the way out and another on the way back in, but it's really close, there would be very little if any loiter time. The H-6 could make it on a suicide mission. But otherwise would be at the very limit of it's combat radius even with a refueling, but the H-6 would an easy target for even obsolete fighter aircraft.