True. But it is quite possible that these "Islamic" customs, which are marked among the Shia and Sufis, have taken over folk traditions which long existed before them.
Also, the Zorastrian traditions of the Persian festivals, would, I suppose, have predated Christianity. And the Persians had their empire in the Holy Land several times.
Ol' what'shisname, Ockham, would probably side with the verse being about the shroud than that it was a pre-reflection of Islamic customs far in the future somehow tied to Persian beliefs.
Gee... do you REALLY think a religion would conscript the customs of older religions... nah... ;^)>