Using a domain or forum to confirm this information will not give accurate results. The multi-signature address^[1] is the most important. There is still 13.15851571 BTC$353,780 in that address.
There were several transactions that took place on 08/09/2023, and then several transactions, so I do not think that they suddenly disappeared.

Does anyone know an explanation for this?
It seems that the service has been back in operation since the end of July. Have any of you received any transactions to his withdrawal address?


[1] https://mempool.space/address/bc1qf8h5k6sash8007vpesymxkw2xsg5d0r3j4l5vmcrwpz2pqu66fjstzgd3r