First, I’m not sure exactly what point you’re trying to make. Is it really that relevant to the discussion that not everyone can personally visit the kelp forests?
Second, it may be far more affordable to visit a kelp forest than you think. There are places in California where you can rent a wetsuit for $8/day, plus another $15 for mask and fins (which also aren’t that expensive to buy your own). You don’t necessarily need a full scuba setup to enjoy the kelp forest. Heck, that My Octopus Teacher guy didn’t even use a wetsuit and he filmed a whole documentary in a kelp forest.