"It's just marketing" is just the "denial" stage wearing a flimsy disguise.
Even LLMs of today routinely do the kind of tasks that would have "required human intelligence" a few years prior. The gap between "what humans can do" and "what frontier AIs can do" is shrinking every month.
What makes you think that what remains of that gap can't be closed in a series of incremental upgrades? Just 4 years have passed since the first ChatGPT. There are a lot of incremental upgrades left in "any of our lifetimes".
You don't seem to be engaging seriously with respected experts in this field who have been reporting for years at this point that merely scaling LLMs and so-called "agentic systems" doesn't get us anywhere close to true AGI.
Also computers in the 1980s could perform many tasks that previously would have "required human intelligence". So? Are you saying computers in the 1980s were somehow intelligent?