Yes, that is the obvious meaning and understanding of Paul’s teaching concerning these jewish laws. It’s the meaning that’s been taught ever since until today. However..
The UCG turns them upside down somehow so they mean the reverse: Christians still must observe holy days and dietary laws. And... the UCG claims this is what the early Christians did - gentile and jew - back then and up to today.
The rest of us are “counterfeit.”
If they observe a day or do not, do it for the Lord and give Him thanks, then it’s good in the eyes of the Lord. Same with food. Condemnation of fellow Christians for those same things? Not so good. Putting a stumblingblock before their brother, is how I believe it’s described.
Observing feast days and dietary laws can lead to greater understanding of certain Biblical matters, the prophetic in particular though, imho. There is good in it. I won’t criticize someone who feels so led, personally.