Well, if
- Wireshark identifies it as a single stream
- Wireshark sees gibberish "TCP" and not an SSH connection
- The gibberish comes after the SSH stuff that you could see (the stuff in there is going to be the handshake, my bad, that is a bit of a technical term)
Then we can be quite confident that your connection is indeed encrypted!
And of course, you're welcome!
Sounds like they think you're not independent enough for the position. If it is a small team, they might need someone who can immediately start being productive, while they think you will need more coaching to get up to speed.
No need to drag any disabilities into this.