I didn't observe it having a humbucker in the bridge position. Rather, the Deluxe series is known for its Lace Sensor pickups. The Lace Sensor pickup family has a unique radiant field barrier system that surrounds both the coil and the magnets, eliminating the annoying 60-cycle hum so common to single coil pickups.
Glen was using the bridge position pickup in all of his solos at the Sioux Falls concert because the Plus Deluxe has a hot-output Red Lace Sensor pickup in that position which gives a fat punchy humbucker-like sound cutting right through the mix.
Advertisement for Fender's Stratocaster Plus Deluxe:

Specwise, the Plus Deluxe series is known for its Schaller locking tuners, Wilkinson roller nut and the aforementioned Lace Sensor SSS pickups (neck position: Blue / middle position: Silver or Gold / bridge position: Red).
Almost just like Glen's—A 1995 stock Plus Deluxe in Blue Pearl Burst (Dust):

Glen's Plus Deluxe is a stock model in Blue Pearl Burst (Dust) (color code: 90) with a high gloss all-polyester finish which was slightly modified after the fact. Instead of the standard three control knobs (for volume, tone, and tone, respectively), Glen had the knobs reduced to a total of two (master volume and master tone only) so that his picking hand could easily rest on the bridge while picking without the regular Strat volume control knob getting in the way of his playing.
Glen with his Deluxe Plus:
