DY: “For example, the Aruch Hashulchan (34-36) explains the R’ma 253 in context of “makom mitzvah” which is equivalent to tzorech gadol”
Punkt fakert. Makom Mitzva is the lower level that is only permitted in a Shvus d’Shvus. He clearly is saying that were it a Tzorech Gadol the Rema l’Shittaso would permit it.