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In the section "Why choice is important" actually says IMO that has to go

I agree it seems confusing, not to mention that set up has not been recommended in a while , at least I can't remember seeing that.
DMT is typically used to lap other hones (DMT 325), or for bevel...

My suggestion is to not do anything more with the razor, if it became duller than before then you are probably damaging it more than honing it.
As far as the grit ratings what really matters is the...

You need better stones than DMT.
DMT are made for tools and such not for razors.

Definitely send your razor out for honing to get an idea what a shave ready edge feels like.