This kind of announcement without an appropriate demo to verify their claims is pretty common with DeepMind at this point. They barely even discuss their limitations, so as always, this should be taken with a grain of salt.
Most of the big labs never go into their models' limitations. OpenAI does it best, despite their inveterate hype-building. Their releases always have a reasonable limitations section, usually with text/image/video examples of failures.
Google does a good job with that too usually. Which makes their last two announcements (IMO success and Genie 3) being a bit light on details is somewhat surprising.
