Making plans for future Grand Tours for Primoz is always a difficult issue. You make plans, and suddenly he crashes. Then it‘s DNF or DNS, short break, another training camp, and to the next race.
It‘s December 22, 2022. Giro is in May, Tour is in July of next year…
Primoz always was extremely strong in the Vuelta when he rode the Tour before. So for 2023, I think Jumbo just lets him start the Giro, to see what happens. The pressure is on Remco, anyways. The more stages Primoz rides in the Giro without crashing, the better it is for his shape. So he benefits for July and the Tour, and could be a late addition for Jumbo‘s Tour squad for 2023.
In case Primoz crashes out of the Giro, he‘ll probably go to the TdF, anyways. Like in previous years: crash out of the Tour, to be super in the Vuelta.
Racing in Italy, especially in the stage races, is super nervous. To be good in Italy, you need luck and bike handling skills. It‘s far from certain that Primoz will finish the next Giro.
And, IMHO, chances are not too bad that Primoz will start at next year‘s TdF.
But, good decision to go to the Giro now. That makes sense, and he can benefit from this in many ways.