If he really belongs to the Gui Chou pillar, the quality of his chart gets significantly worse, possibly a broken chart structure. He can still make money, but it involves a lot of "clashing" between the zi and chou to free the hidden beneficial elements inside these earth "graveyards". Because all of this happens "underground", the work he does to get there is not as visible as if he had the visible output in his Jia Yin Pillar. It becomes a lot harder for him to unlock his wealth.
The biggest issue with a gui chou hour pillar is that the hai in the upcoming gui hai pillar is no longer distracted by a combination and will clash with the Si in his month pillar. As the month pillar is related to career, it indicates huge instability in his work. If this really is his chart, would advise planning to step back and transition out of high risk, high conflict roles and look at "Resource" roles like teaching, advisory or compliance. Also to stop chasing high risk speculative gain in his investments and move them into safer instruments.
As earth is not a favourable element in his chart, having the wei element in his spouse palace is not really good for either hour. I find unfavourable 7k spouse palaces tend to indicate control/dominance issues between the couple. He might be bringing the aggressive attitude he puts into his work home and treat his spouse/children like his staff. The Gui Chou hour however, is much worse for his relationships because of the chou-wei clash, and because he no longer has the wood to restrain his aggressive 7k energy.
Lived experience is always the most accurate.
Does he thrive in high pressure environments and easily find success? Or he succeeds by grinding through the high pressure, and it's extremely painful for him?
Are any marital issues mostly resolvable friction, or there are frequent bad fights that have you considering divorce? If you have children, how is his relationship with them?
Does he have problems with backstabbing and hidden traps in his career? Like something goes wrong and he has no idea who may have sabotaged him.