Note: a less cynical take is this: GodDAMN buffer employees must be happy working there if they tolerated transparency to this level...which, really, is the best win-win for all kinds of transparency scenarios.
While some of them do work overseas, Buffer employees should note they're drastically underpaid for Silicon Valley, NYC, or even LA salaries. If they didn't know this before, they should now. Any mid-level dev with decent skills would start around 110-120k before benefits in a highly competitive job market. I know because I hire and offer these salaries right now.
Anyone heading customer service would be in a tier within the rest of customer service, capped at around 90k. This is especially true for a small startup where their duties aren't managing a huge customer service team but rather playing the role of basically another customer service rep.