Earlier quoted context omitted.
If your target browser is IE8 and you write a bunch of html4 that looks great in IE8, I would expect it to not work anywhere else. Not only is IE8 a snowflake but html4 is particularly hard to get a good layout working. Lots of nontrivial layouts in pure html4 (and css 1/2) require tons of browser specific hacks.
You missed his point. He mentioned IE8+ and Opera as working targets to highlight the fact Safari was being lame. He said every browser - that would include complaint ones like firefox and chrome. He also specifically said he avoided browser specific hacks.
Something working in opera doesn't mean it is standards compliant.