No, pretty sure those stats are usually regular season only and do not count postseason.
If I was Diggs, Allen and the Bills I'd draw up a handful of plays where Diggs is the outlet/lay-up and just get him his 6 receptions. I mean last year we were playing for Beasley to get his 1k (came up just short) and were also just messing around in some games late in the season trying to break the record for number of players to catch a TD pass from Allen in one season.