[Onelifetogive]

From the EWTN website, it states that it is a "mandatory tradition" for those who wish to follow the Roman Catholic tradition.

Can that be translated as "It is a sin to not comply"?

[MeanWestTexan]

"Can that be translated as "It is a sin to not comply"?"

Not a Roman Catholic, so "I don't know," is my answer.

My GUESS, being Anglican, is that they would not "be in good standing" and thus not able to hold lay office in the church that year.

I do not believe it is a matter of "sin," so much as "respect." Basically, if you don't "respect" the traditions, go somewhere else.

[Petronski]

Can that be translated as "It is a sin to not comply"?

It shouldn't be. The practice is encouraged, not mandatory.