So they give you a 20% pay cut for 4 years, then pay you 80% in the 5th year when you're not working, presumably when they forecast they'll have no work for you anyway...
Say you're on 100k, they cut that to 80k for 4 years, saving themselves 80k over the 4 years, they then pay you 80k in the fifth year to have the year off... So they've saved themselves $100k per employee, and all you've gained is a year off, with $100k less in your pocket than you would've had on normal terms
Sounds like a good deal...................