Yeah I do feel the OA is being overly flippant with their use of human cells here, likely for PR sake, which would be an ethical breach for me personally. Overall though, I find most research cases for human cell lines to be in line with my personal ethics. Neuron lines can certainly be used for good or ill, and this case leans towards the latter, although understanding the human brain may justify this line of work in the long term. If only we didn't live in a militaristic late stage capitalist society...