I think they were complaining about grammar. Shouldn't it have been 'spending' rather than 'spend'?
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.
It would be weird (but not necessarily wrong) to use that word as a noun outside of a business finance context.