And maybe when he says he can't afford $100k/year he means $90k is his max? Probably not....but maybe...
Depends on the location. In a major tech center (Silicon Valley, NYC, DC, etc.), nobody who is proficient in even one language is going to get out of bed for 90 or even 100k.
Fundamentally you have strings, integers, arrays and the like and you spend a little time learning a new IDE and some syntax and you're more than halfway there.
Not halfway, by a long shot. You should be able to learn the basic language constructs in a few hours. But that doesn't mean a thing. Each language has its own idioms, APIs, standard libraries, typical addons, development frameworks, testing frameworks, etc.
If I sub some Java work out to someone who writes Perl code translated line-by-line into Java, I will reject it for the unmaintainable garbage that it is. If a sub reimplements a JDK or apache commons function, that's a rejection.
To verify proficiency in a language, I usually ask a few compare/contrast questions in an interview because those are hard as hell to answer if you've just read a "_____ For Dummies" book (e.g. "What's the difference between C and C++?" "What's the difference between SOAP and REST?". That type of thing.). Then, I ask to see one of their projects in that language on GitHub. Generally, that tells me all I need to know.