Thanks for your comment but you are incorrect. Both iPhones displayed 5G during the test. Of course 5G speeds can go faster but it varies based on location.
Most phones display 5G when connected to a 5G capable tower. This doesn't mean they're getting 5G speeds or even a 5G connection. I just did a quick test om my Pixel 4 XL and it got 128Mbps on a 4G modem. Tom's guide did a test without the proper controls, didn't even get 5G performance, tested it on different phones and didn't bother to look up the actual difference between the modems they're comparing. News flash, the upgrade provides more energy efficiency, not more speed. And then they slap a headline on there that suggests the whole phone is a year behind.
Tom's guide, this is why people hate journalists these days, you give journalists a horrible name. Don't do this to your valued colleagues who do take stuff seriously but get the same horrible reputation as a result.
If the phone is still under embargo, wait until it lifts and do a proper controlled test. Or report on facts you can already find out about the difference between these two modems. Don't just make up nonsense. And yes, people are buying these phones right now, but they won't ship until after the embargo lifts. If there is a real issue they will have plenty of time to cancel their orders. But we all know there is no issue anyway, so stop using the excuse of "warning consumers".