I agree, its pretty obtuse.
But I think the point he is attempting to make is noteworthy. As one who believes the mission Jesus charged us to perform (working to bring others to Christ) is useful to Him, my feeling is this: many of those who deny the efficacy of that mission from a position of alleged authority and contend the scriptures "prove" their case are actively propagandizing against the earthly mission of Christ's Church.
And what else would the adversary do to "improve" on that situation?
The possible loss of salvation of others is a high price to pay for what comes down to an argument over semantics.
v.