Yes. I believe you have to stay a year to keep the bonus, but everyone I know who graduated from Stanford last year was offered >100k salary, 100k signing bonus, and some stock (I think per year the stock was about 25k at current market value).
Even non-CS majors. If they studied a quantitative field, can code, and cleared the dev interview, they got that offer.
Those numbers, in general, are high. You might get that if you get them into a bidding war.
In general, a publicly traded company is not going to give that kind of package to an undergrad. Maybe $110-120k in salary, but the stock amount is more likely to be around $80k vesting over 4 years.
100k-ish stock vesting over 4 years is pretty standard among the big SV companies for new grads. It can be a lot more though if you're not a new graduate.
I don't think anyone else gives $100k signing bonus, so yes the numbers aren't representative of the whole but it hints at what an undergraduate can command out of college.
I'd say $100k salary is very typical, as are the RSUs (vesting over 4 years as you said).
