The last I saw on this, CG never acknowledged it's an issue. They didn't think there was an advantage to only joining with 40 players. After getting heavily sandbagged three TW in a row, I thought I'd...
While sandbagging in general is an issue, this particular case has been explained well enough. TI presented a legit reason as to why they could not go in full and I'm more inclined to trust the list of past 18 TWs posted by Nebulous than "proof" of a track record of sandbagging pulled out of thin air by OP.
(Especially since we faced TI at full strength 4 TWs ago and their fallout, that was also explained, only affected the past 2 TWs).