Christian conversion is the transformation of one’s own identity in relationship to Jesus Christ. One “self-identifies” in relationship to Jesus Christ. The psalmist self-identifies as:
One who loves God’s commands (119:127) and who considers all God’s precepts as right, or smooth and straight (v. 128).
He loves God’s mitzvot and piqudim, commands and precepts, “more than gold, more than pure gold.” He self-identifies as a lover of all of God’s ways: which of course means he not only likes them but follows them.
Again, we are back to the integrity claim of vv. 121-122.
It is possible, as Samuel Hirsch points out, that v. 128 indicates some thought parts of the Torah were wrong or of no use for Israel. The psalmist, a radical if there ever was one, was committed to every word and every command.
Because he loves God’s commands and precepts, he hates “every deceptive path.” He’s clear in his thinking: he knows what is right and he knows what is wrong. He has chosen the former; he’s turned his back on the latter.