Obviously do not take the word of forumers on this one alone, talk to Van's.
It looks to me that the only thing this hole rivets to is the rear spar, in which case it may end up being sufficient to flatten and thoroughly deburr this hole, then drill two more holes, one through the spar and one through the rib.
Also, kudos to you on the edge deburring and the crispness of your dimples.