I don't see where your link proves that the need for the observance of the things mentioned in Colossians 2:16 has been abrogated as CovantininBlood asserts.
Perhaps CovantininBlood will have some defense for his statement.
That's unfortunate that you didn't grasp the principle set forth by the author concerning the 3-fold aspects of the law and either their perpetuity or their abrogation (fulfillment).
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Let's look at the passage itself for it gives the answer most clearly:
Colossians 2:16-17 (ASV) Let no man therefore judge you in meat, or in drink, or in respect of a feast day or a new moon or a sabbath day: which are a shadow of the things to come; but the body is Christ's.
Paul's overall purpose for writing to the churches at Colossae was to warn them of and reject the false teachings of the Judaizers and Pharisees. Thus, Paul, under the inspiration of the Holy Spirit and out of the teachings he received directly from Christ, gives a list, a partial list to be sure which is enumerated throughout his other writings, of those things which must be disdained and totally rejected for they destroy the gospel and the truth of free grace.
He relegates these regulations, i.e., 'additions' to the gospel [at best] as 'shadows of things to come', i.e., they are at best out of date, long ago discarded by God himself. Even when God was still using them in the old covenant He employed them only as "a shadow of the things about to come," to be superseded by these things when they arrived, i.e., by the great realities themselves, the actual substance or "body." What these substantial things are, and how all of them are "Christ's," i.e., belong to Him, Paul has already set forth at length in 1:13-23 and 2:9-14. They are certainly tremendous. The old shadow has completely faded away before them.
It is therefore correct to say that all those regulations (additions to the gospel) have been abrogated, for they have been fulfilled in Christ of whom they all pointed.