Cutting Advertising Budget During Slow Months

The marketing company that my franchise is working with claims that cutting our PPC spending during our slow months causes a delay in "picking up relevancy" when we start spending again. EX say we usually allot $1,600/mo, we halve this to $800 from January - March. In May, we return to our usual budget of $1,600. Is that money primarily being used to help us "climb back up the ranks", per se? Any sources where I can read up on this? Thanks!

Also, super new to the world of marketing. Sorry I'm probably not doing great at explain or asking a particularly dumb question