I think pantufla simply did a global search for "humbolt" (without the "d") and expected everyone else to do research whether or not the spelling is correct or not.  
This is very poor practice, everyone can do searches, but research takes effort.

Note that while "humboldt" is the proper spelling, if someone got it wrong and it has always been wrong, then that wrong spelling is now "correct".

I think the little green piece of grass "humbolt park" is what the original note writer wanted to point out.  for this case I don't think it matters whether this is spelled correctly or not, it's so minor that it's easily glossed over.
