An HAI Pump can be used for both purposes - to get liver tumors reduced in size/number enough for a patient to be able to have surgery OR after surgery to lessen the chance of a recurrence. (Approximately 50% to 75% of patients develop a recurrence of the disease within two years after a liver resection.)
In my case, I had the liver resection and at the same time they implanted an HAI Pump. I then had several cycles of FUDR in the pump. Like your husband, I was also on Xeloda both pre-surgery and post-surgery. Since my HAI pump treatment my liver has remained completely clear.
Soooo.... in terms of your question, since your DH already had a a liver resection, it is vitally important they monitor him for a recurrence. Make sure he is getting frequent scans and CEA tests (assuming CEA is a good marker for him). Personally, if I were you, I'd have a consultation about the pump now. But, due to Covid travel issues + living farther away from NYC + the fact that he had only a single tumor in his liver, I can understand waiting. But ONLY if he is heavily monitored. And at any sign of a recurrence, I would immediately arrange for a consultation with Dr. Kemeny.
MSK was also "several states" away for me - I live on the west coast. But sometimes you have to do what you need to do. So don't hesitate to call Dr. Kemey's office if you want a consultation. I hope your DH stays clear now and everything turns out fine. But the HAI pump is a Godsend if you need it. Trust me on this. I wouldn't be alive to be writing you now if it wasn't for it!
Hope this helps!
Juliej