"Touchbar MBP", what model would that be? If it's a pre-T2 chip model, so Trisquel 9 should boot. With the T2 chip, one should disable the secure boot first in order to be able to boot other operating systems.

I have no problem booting Trisquel 9 on my Macbook Air 2015.

https://support.apple.com/en-us/HT208330

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