So hobbyists in the electronics business have never heard or seen fluke? Seriously, that's what you're going with? ANYONE that has spent 30 seconds looking for a multimeter has come across fluke, and every one of their multimeters are the same color. You'd struggle to make something look anymore similar to their multimeters short of putting the fluke name on the front.
I'll give you a hint - the guy who works for sparkfun in the comments section of his own blog post said:
Yea, it’s hard to say whether Fluke has done such an amazing job at branding that we all think Fluke yellow is the color of DMMs or if they are simply capitalizing on a color arrangement we all generically know as ‘multimeter’.
They knew EXACTLY what they were doing.