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It's been ages since I researched this. Maybe I read about hot bonding but forgot all about it. I think there are 1 or 2 people who've made their own tents out of DCF and published the details. IIRC they were stupidly light. But the fabric is so costly and can be out of stock everywhere for months.....it would be a real bummer to mess it up. If you had to buy the fabric twice it might be cheaper to just buy a Big Agnes one.
I'm actually going to backtrack and apologise. You are right, I am wrong. But, the tape you linked is repair tape, rather than the kind of tape that is actually used to attach one piece of DCF to another. Hot bonding is the best method of creating seams in DCF tents AFAIK.