He didn’t its sabbath(s) plural. The Bible is not meant to be read just on the surface And will explain itself if we allow. Plus it doesn't fit the context of the Sabbath ending at the cross as it was kept decades after Christ died. The annual sabbath(s) ordinances all pointed to Christ who became our Sacrificial Lamb and Passover. Sin is still defined as breaking God’s law 1 John 3:4, Romans 7:7 which is why we needed sacrifices in the beginning For breaking God’s law.
Paul is quoting from in the old testament and look at the within scripture and chapter contexts and overall context and know what Paul is referring to from the old covenant scriptures. The Greek words used in Colossians 2:16 is in context to no judging others in regards to the **new moons,** **meat and drink offerings** and **the sabbaths** (**plural sabbaths are being referred to here as the Greek is genitive neuter plural application - GNP**) **in the annual feast days**. It is not talking about the weekly Sabbath. All of the above were shadows of things to come (Col 2:17). All the things listed in Col 2:16 were all shadows of things to come because they were all linked to the **old covenant Sanctuary laws of animal sacrifices and sin offerings and the Levitical Priesthood for atonement for sin that all pointed to Jesus as the promised Messiah and Gods' sacrifice for the sins of the world once and for all and Jesus as our true high priest that stands in the presence of God making intercession for us (see Hebrews** 7:1-25; Hebrews 8:1-13; Hebrews 9:1-27 and Hebrews 10:1-22). Its **impossible** for God's creation seventh day Sabbath which is a **memorial** (Remember - Exodus 20:8) of creation to be a shadow law of anything because** it was made before sin **not after sin when man was in perfect harmony with the creator and **points backward as a memorial not forwards to things to come**. All shadow laws were made in the old covenant as part of God's plan of salvation **after mankind had sinned** as a promise of God's salvation from sin and of things to come in the future through Jesus. The creation Sabbath was made **before sin so cannot be a shadow law of anything **which is why it is a memorial in Exodus 20:8-11 that points backward to creation in Genesis 2:1-3.
The ceremonial sabbaths in the annual Feast days are different from God's creation weekly seventh day Sabbath that is Gods' 4th commandments and a memorial of creation pointing backwards to Genesis 2:1-3. The ceremonial sabbaths in the annual Feast days can fall on any day of the week depending on the yearly cycle and are linked directly to the Sanctuary and Levitical Priesthood through animal sacrifices and blood atonement for sin.
This 'handwriting of ordinances' our Lord did blot out, take away, and nail to His cross. (Colossians 2: 14.) But the moral law contained in the Ten Commandments, and enforced by the prophets, He did not take away.... The moral law stands on an entirely different foundation from the ceremonial or ritual law. ...Every part of this law must remain in force upon all mankind and in all ages.
—JOHN WESLEY, Sermons on Several Occasions, 2-Vol. Edition, Vol. I, pages 221, 222.