I tried accelerating one of the transactions with ViaBTC and it did nothing. Never tried Antpool, though. Is that a free accelerator?
ViaBTC still works as far as I know, but is heavily oversubscribed and difficult to get accepted... like you need to submit within the first second of a new hour, and even then it's not guaranteed you'll beat the bots
Also, their broken system still calculates your fee using sats/byte... not sats/
vbyte... So, if you've used a SegWit transaction, it's possible that your 10 sats/vbyte fee won't meet their 10 sats/byte minimum fee requirement. I've actually tested this with a transaction that I was sending a few months ago... I had sent with a 10 sats/vbyte fee, but their system said that my fee was too low (recorded it as ~6 sats/byte).
As for Antpool, as far as I'm aware, that one has not worked for years. From memory, someone published the details here and on reddit etc (it wasn't well publicised at the time and was a "hidden" service) and then it would appear that it got flooded to the point that Antpool just quietly stopped using it... the page is still accessible (if you know the URL), and it'll still say "transaction accelerated" etc when you submit a transaction... but the transaction will never get mined (by AntPool) prior to it being at the "correct" fee level