In reading that, I see that “Orthodox” (as he spells it) should actually be “orthodox” - thereby not a “proper name” of a group, but more in line with what he’s saying.
And then, “Catholic”, as he spells it, should also be “catholic” - and not used as a “proper name” - being that this would be the actual name of a church group - while “catholic” is not.
I would hope that he would make those corrections ... :-)
For me, the value of the site is the essays that he has compiled, not his introduction.
If they are unintentional misspellings they indicate an amount of carelessness that is surprising for someone with a Master’s of Divinity. If they are misspellings then they indicate some very muddled thinking.
He is a Baptist who has discovered that all Christians are catholic and should be orthodox in both belief and practice. Maybe he is avoiding the shock factor that a Baptist experiences when he is told he is catholic.