That's a fair question. I think, though, that what it does is fix a past wrong with regard to the language, and that has to be done by another bill. It has to be done by another act, which is what this is doing.
You're right. As for raising the status of Remembrance Day to encourage people to honour this important day, that could have been done by a motion but it wouldn't have tidied up the language, which I'm trying to do at the same time.