Question about <The Deadline: A Novel About Project Management >

hey guys, I'm reading <The Deadline: A Novel About Project Management >
from Tom Demarco these days, while at chapter 14,
the morovia's first programmer suggest 'the last minute
implementation',let the team defer coding,using 40% time or more to
elaborate low-level design which should map precisely,perfectly to
final code.And not arrange time for debugging.
This idea seems quite strange and boldness,
I think debugging is quite a necessary and unavoidable situation,
I'm quite uneasy about the crazy idea advocating not arrange time
for debugging.
What do you think about this idea?

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