I imagine, given that this deal was completed after the deadline, and after a trial, that he was signed because the main target went elsewhere. Although the Lewes Chair being uncontactable may be on alternative reason.
Obviously, there was interest in Smith, but Sinclair was expected to be the second signing... So Smith was offered a deal very late when the main target failed to sign.
Perhaps, we can say that the club had a backup plan?
I hope he works hard and does well. If he's an attitude like Roofe, he could be a great success.