That scripture is very easy to misunderstand.
Verse 15 as you highlighted that customs/ordinances/regulations (namusa) were traditions of the Pharisees, not of Torah/Law itself.
Ephesians 2:15, "namusa" (Aramaic) in context can only mean, TRADITION, as defined "commandments of men", which may be an attempt at "extending the use" of a "Written TORAH commandment", but lack the "Spirit of TORAH". Instead of "setting free", they "lead to bondage", unjust practices, and are burdensome, when applied in certain cases, such as is mentioned in Ephesians 2:15, and elaborated upon, by Yahshua, in Matthew Chapter 23.
contained in "Ordinances" = 1379 (Greek). dogmatizo dog-mat-id'-zo from 1378; to prescribe by statute, i.e. (reflexively) to submit to, ceremonially rule:--be subject to ordinances.
This is where we get the word "dogmatic" meaning 'inclined to lay down principles that are not able to be denied or disputed to be true.