I would have associated the number 8 car with Dale Earnhardt Jr. I have not been following NASCAR and did not know Kyle had been hired by RCR.
Richard Childress Racing debuted the Number 8 car in 1981.
At sometime it went to Dale Earnhardt Incorporated.
The Number 8 car went to Chip Ganassi Racing and was shut down in 2009.
https://en.wikipedia.org/wiki/NASCAR_operations_of_Chip_Ganassi_Racing
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Richard Childress Racing returned the Number 8 car in 2018.
https://en.wikipedia.org/wiki/Richard_Childress_Racing_in_the_NASCAR_Cup_Series