According to archive.org[0], looks like just now has Dell removed the red highlighted part that mentions the warranty. When I looked at the page earlier today, it was still there.
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Under no circumstances should you leave a laptop powered on and in any sleep/hibernate/standby mode when placed in a bag, backpack, or in an overhead bin.
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``` Under no circumstances should you leave a laptop powered on and in any sleep/hibernate/standby mode when placed in a bag, backpack, or in an overhead bin. ```
[0] https://web.archive.org/web/20210624044948/https://www.dell....