What makes you think this? The only limit on withdrawals is if the hot wallet runs low and needs to be topped up. There's a delay while the top up gets confirmed. There can be delays too if someone with a balance greater than the hot wallet balance tries to withdraw all their coins - if they withdraw in small amounts though it works.

Edit: I just read your quoted section. The reason that user couldn't withdraw is they were trying to withdraw less than the minimum amount of 0.01 ppc/btc.