I don't know about checking every 20 minutes, but I have seen TII checking in on chat sporadically even before the deadline was extended and continually ever since. I did not see DL at all yesterday, but I have seen him at least twice since the deadline has been extended, and he has stayed for quite a long time. In saying this, TII checking and then leaving continually is just as good a method for finding DL since he doesn't log into chat without staying for a while. If anything there appears to be a major timezone conflict here, or if not, one or both players is purposely avoiding the scheduled time as majofa stated. But continuing to extend the deadline like this is just pointless; if it wasn't completed after the first extension, then I think it's pretty clear this match isn't a high priority and I seriously doubt forcefully telling either of them that the match needs to get played will change anything. As I recall, it was stated by mrblonde in chat that TII was more active before these deadline extensions got out of hand and even then that was mainly just to prevent the 1st round of Budokan from ending in a "lame" manner. But let's be honest: This could continue on for the rest of eternity and I'm already bored of this Event completely because it's not moving anywhere; sooner or later you're going to have to make that call, regardless of whether or not the result is anti-climatic.
Also: Let's adhere to the rules as much as possible, mkay?