You’d be correct.
Both my NH Grandmother and my Prom date of 1961 used “cahn” and “cahn’t”. Grammy also used “shahn’t”. (shall/should not).
Then there’s “twenny”. (20).
And “Bea’ulls”, British singers with funny haircuts from the 60s.
Don’t rely on Vermont’s Senator (I-VT) for a Vermont accent.
Thanks for the memories (Singin’ in the Rain) -
https://youtu.be/YZwZO40r4X0?si=RbPFlE-9-RTaR49G