Yeah what that doesn't say is of course that those tensions have escalated from "critical" to "critical-and-also-FUCK-you". But as I pointed out in the post you're replying, seizing vessels by either party is not something new. That's been happening for decades. What's new is that China used to get a free pass, and this was a ship going between Iran and China (the US has even hinted it was delivering weapons to Iran, which China explicitly agreed not to do, of course they've also been caught providing targeting information to Iran)
And I get their position: realistically Iran has much less weapons now than they had 3 weeks ago. The US has more weapons now than in the 12 days of war, and the Hormuz blocking ... doesn't matter at all for US combat power. Same for Israel. So Iran must be desperate. They're, let's call it "mostly, but not yet totally out of options". And the US + Israel should be at close to double their previous strength. The Iranian population hates both the Iranian government and their fighting force, so you can bet your firstborn Israel is receiving targeting information from inside Iran without even trying, with the exact location of every IRGC commander, every government official, half of it from their own mothers. The previous exchange was a disaster for the IRGC. They fired at least 10000 rockets plus drones. They actually hit 3 targets. Anyone the least bit higher up in the IRGC is terrified.
The previous kinetic exchange wasn't even using 2% of US combat power, now it looks like they're ready to double that. The US has been delivering weapons non-stop to middle eastern bases since before the ceasefire started, if you calculate it out it would have been about 800 tons per day, 13 days now, so let's round it to 10000 tons by the time the ceasefire ends.
But in general Iran has never been at peace since it's current rulers came to power, frankly, with anyone. Until their war with Israel they got away with literally everything by using proxy forces. Literally before the first month was over they were at war with Iraq, because they were doing back then what they are doing now: organizing militias in Iraq.