It's for them to legally CYA, rather than to fu*k you over.
They don't want to commit to an exact amount down to the penny, in case there's something slightly deviating from that, but the amount you've been quoted is pretty much spot-on to what you'll get, if approved for the VSP.
You've got to look at this as a crossroads, in an overview of your career's trajectory as a whole, rather than being petty about granular specifics, wringing your hands over a potential few or even hundreds of dollars' difference, with the VSP amount.
Ask yourself: "Does this deal they're offering me IN GENERAL make sense for me at this time in my life?" Instead of: "I STG, if they sc--w me over for even ONE DIME, I'm gonna sue!!!"
This is FREE MONEY that they are GIVING you, without you having to work for it!
Just take it (you've been given a quote of how much it will be, which is more than likely not going to change) and just be grateful, and free to go on with your life!