Trump has moved himself outside of the system of American democracy and to this day refuses to acknowledge a democratic election result[1]. So yes, actively supporting him at this point is supporting an end to American democracy, pretty objectively. Linking the overthrow of the democratic order with terrorism, just after a mob entered the capitol and successfully interrupted the democratic order for multiple hours, doesn't feel a huge leap.
Being conservative isn't linked with terrorism. Being libertarian isn't linked with terrorism. Supporting somebody who rejects democracy is linked with terrorism. It's seems pretty clear cut to me.
[1] He said that a new administration will enter office but never that it does so rightfully based on a legitimate election.