Why so negative?

The post 1st validates Microsoft claims whether they hold. His tests show that Edge is faster on SunSpider/Octane, but not by the margin that Microsoft suggested. The article also points out that old HW is used as the test bench and that HW will make a difference.

Then the article expands the scope to other benchmarks, and there is a (subjective opinion) that Peacekeepers results hold in real world.

I can't see where the author is upset. Rather I see a typical geek hobbyist experiment and the results posted to a FORUM community - not to a professional or scientific publication.