While this is sort of interesting, it strikes me as largely price constrained. Really, the physical act DNA transfection is a menial lab task that is essentially glorified mixing where the major challenge is ensuring correctness and sterility (neither of which seem to be a concern in biohacking). At my college they'll let any enthusiastic freshman do that week one after just a couple hours of training (mostly concerned with correctness, sterility, and what drawer the pipets are hidden in).

The more interesting thing would be if they could biohack PCR, sequencing, or even cDNA creation but all of those run into intense price barriers rather fast as you start to need enzymes and machinery. Some of the basic assays could be purchased for rather cheaply if the cost (in the several hundreds for the materials to do around 100 tests) was split.

Not to say that all of this might become possible on the cheap in the future (PCR wouldn't be that hard if you purchase Taq polymerase, ~$100/100 rxns) but it amused me to read a comic excitedly proclaiming a DIY kit for unsterile, inconsistent transfection.