The post (I believe) is inaccurate.

When a vote is bought, it now bids for the 50% of the payout instead of (the old) 75% of the payout.

Since the beginning of the bid-bots the following marketrule is stil true:
input = output
1usd goes in -> 1usd comes out (the ratio is just different)

So not only does the buyer receives the same as before, the bot does (and thus the delegators should) also receive the same as before!