Stock would be hard anyway because they vest over N years so how much you vest in a given year depends on a) your promotion velocity b) whether you got any gold stars/special bonus grants and c) how you ranked within your peer group.
At the same time I had people working for me who had 10 times as many options, but had been in the company for ages and received the vast majority of those options before the crash in 2000. As of this year, the couple of those people who are still at Yahoo will have options worth maybe $30k-50k total from 10+ years of employment that are over water, and their older options will start expiring soon.
Of course Google people receiving new Google options now are currently in a better position, but estimating the value of options grants over time is tricky.
The position above, Senior Engineer, averages $130k.
There doesn't seem to be an incentive for 1,500 people to understate their earnings by 50%+ on an anonymous poll, especially a poll of engineers at one of those most engineering-centric companies in the world, where corrupting a dataset would likely feel akin to high treason.
Not inclined to trust second-hand information from one individual - sounds like they're either working at a much higher level than regular programmer, inflating their salary by including perks/stock/etc to make it seem higher, an extreme outlier, or just lying (people who tell their friends how much they earn in casual conversations also sound like the kind of people who would inflate that number).