That's one sentence from a fairly extensive writeup, so yes, in the more complete context and elaboration of this excerpt I am in disagreement with it. IMO Free Grace ("FG") has a very weak presentation of what Faith is.
Since you've listened to this theology for 44 years (which doesn't really identify actual study time), you've likely heard the statement, "if you add anything to faith, then you're not saved." Did you ever hear the retort to "Faith Alone" that "Faith is Never Alone"? There's normally some reasoning from the Word for such mantras.
What I want is to understand God's Word and I came to understand it differently than FG teaches it. As mentioned above, I understand Faith differently than what FG teaches. Thus, I will read several things in Scripture differently than FG.
The rhetorical question you ask re: me or anyone who sees soteriology differently than you, is not well reasoned and is a typical assertion of works salvation, which is ultimately one of the main reasons there is a FG soteriology. IMO it's a pendulum swung too far in order to protect against works salvation. But having swung too far it too ends in error. Thus, the Faith is Never Alone retort against FG and some others of Faith Alone soteriology.
Legalism is also one of the typical retorts that's not well reasoned IMO. Firstly, it rarely comes with a definition and when it does it's not unusual to see 10 people with 10 different definitions. It's not a retort I even pay attention to anymore. I understand the transition in eras from being under Moses to being in the NC and in Christ. And I know I'm in Christ by Grace through Faith, which again, Faith that I see differently than FG.
The better discussion I'll start heading back into now is about what Scripture actually says and means. If you have serious questions apart from inferring I have a problem because I left FG Theology, I'll consider the continuing the discussion. But calling me a liar and even softening it a bit but not admitting it was wrong is not the best witness for your training.