Exactly. Seems like the author is suggesting a timer with 4.9 seconds left should tell you it has 4 seconds left instead of 5. Not sure why anyone would think this.
The tidbit about it displaying 1 even if there is 0.01 left is interesting though. Makes sense.
reddit works like this if you get downvoted and only get to post every 10 minutes. it tells you you have to wait 1 more minute, and then a minute later it tells you you have to wait 59 more seconds, very counterintuitive. gets me every time when I have a post typed out and it's putting me on timeout for going against the grain (like e.g. suggesting that mob justice is bad)
Only at 0:00. That's a separate feature, showing 0:01 at a minimum for a paused timer (presumably to make it very clear that you aren't looking at an expired timer, even though the UI disappears for an expired timer.)
The tidbit about it displaying 1 even if there is 0.01 left is interesting though. Makes sense.