I don't know which Dave that person said, whether he succeeded or not, it's clear from his words that he seems very happy because his Bitcoins can be recovered.
walletrecoveryservices can be helpful for recovering a password (if it's weak or you know a part of it) or the seed phrase (if you know a part of it).
OP's case seems to be different here. No one can recover the fund sent to a scammer.
If i may ask what exchange do you use to send Bitcoins, local exchange or Trust Wallet or similar, looks like you should ask for help from the exchange or Trust Wallet to trace to whose address you are sending.
In the case OP has used a non-custodial wallet like trustwallet, he can't ask them for help. Such wallets give you full control over the fund and they have no access to transactions history.