Arso, lostspark, the Ohr Hachayim is not saying that Yaacov’s guf is alive forever. The Torah says that at the time he expired he was not a mes and the posuk 50:1 is what the Ohr Hachayimis commenting on; it is only later in the parshah where the Torah says that Yaacov mes.
In fact, the Ohr Hachayim is saying that Yosef embalmed his father so they shouldn’t say that he didn’t die.