I'm not so sure about that. The Browns had some lean years going back to around 2016. I'm not going to do the math on this because it would just give me a headache. But I remember them having some ridiculous cap space for several years in a row. No way you make up for that, even if you go 100% the next two years.
The math on this can also be tricky. Even if you only spend 50% of the cap one year, as long as you carry over another 35%, you're 85% as long as you spend that money at some point within the 4 years. It's really hard to keep track of.