“a p’sak of R. Yakov Emden”
Rav Yaakov Emden is a das yochid amongst many achronim concerning a mitzvah that had been practiced but is no longer considered a mitzva in our day; Rav Yaakov Emden paskins in a long t’shuva that it is still applicable in out times. I assume that the Wolf does not want everyone to be machmir, only himself as a baal nefesh, to be able to be m’kayim this mitzva.