TPS wasn’t part of last year’s Unofficial Loot Hunt. It was added as a fun way of expanding the Hunt but at a manageable scale. There are various items that could have been added to the main ( BL2 ) Hunt, such as the Slaughter rewards.
The decision to cut out a huge chunk of items from TPS is simply because they are items that are found in BL2 ; they also have no dedicated source - so it just ended up looking bloated. The Boomacorn, Machine and Pumpkin were axed - I can’t even remember why - but in retrospect I’d personally prefer to have them in the Hunt and eliminate the “Arbitrary Legendary 5”. However , all the items that have a dedicated source are included.
The first half of that sentence just might be true
; but people are poking us as to why certain decisions were made.
At the end of it, this is The Unofficial Hunt, completely informal, as is therefor subject to the whims of the runners 