It is most certainly not irony.
" a selfish preacher will not skillfully adapt means"
I read very much of the other stuff on that web site. And he most certainly does promote the idea of using means and methods along with the gospel.
Stuff like particular timing and environment control. As he puts it was but not to warm and well ventilated, and comfortable seats.
He also says there are 4 agencies of salvation: God, the word, the preacher, and the individual. It's decision theology and he promotes soliciting a decision for Christ.