Headtube aside, neither fork options are their design so could they not have just chosen a carbon disc road fork for the bundle? There are plenty from the east that they could rebrand
It is if you use enough of it. I wouldn't use a <300g road fork on a tandem, but even that is probably more superstition than physics, a good one is probably stronger than the 531 forks which have served generations of tandemists.
Headtube aside, neither fork options are their design so could they not have just chosen a carbon disc road fork for the bundle? There are plenty from the east that they could rebrand