If it feels like an Alberti Cipher it is one!

[davidjackson]

Not sure if I follow you.
An Alberti cipher is always one to many - it masks frequency distribution. It's polyalphabetic.

Alberti cipher using codephrase "elephant":
the sun was very hot today becomes SFAQU LCQVB QYBMS RKAEY
"t" can be "s" or "r"; "h" can be "f" or "b"; etc.
There is no frequency distribution.

If it's monoalphabetic, it's a Caser shift cipher. But then frequency distribution exists.

Caser shift -2:
the sun was very hot today becomes rfc qsl uyq tcpw fmr rmbyw
And we can see that "t" is always "r"; "h" is always "f"; "e" is always "c", etc. The frequency distribution of the letters is identical (r appears the same numbers of times as t, h as f, etc).

You say:

But if there is a code/cipher, it could be more complex or related to and better technology than an Alberti cipher. Yes?

Difficult. Why? Because improved ciphers require mathematical knowledge that simply wasn't available at the time the manuscript was assumed to have been written. And anyway, the majority of similar ciphers are based upon the same principles as the Alberti and Vignieré ciphers.