As you wrote it, it could be an IP partnership, Apple opening a fab, or something else.
Both are public companies so they might be required to reveal these details
The initial headline also conveys both that there is current spend with Broadcom, and that the future spend is higher than current levels.
It would be weird (but not necessarily wrong) to use that word as a noun outside of a business finance context.
I think it is interesting to attempt understanding people's choices to shorten "spend" rather than "spending," or to use something longer like "methodology" rather than "method" when they describe the method not a study of methods.