Linitis Plastica - husband struggling to eat. Any advice?

My husband was diagnosed with this rare stomach cancer 3 months ago. It is heartbreaking to watch him lose weight, he is unable to eat and can only take supplements. He is so fed up with them and it is a struggle to take them, he doesn't like sweet food. The dieticians advice is to fortify food but very difficult if he can't eat, not liking cream or sweets and not tolerating solids. He just finished 4th course of chemotherapy FLOT, possibly this could also contribute to loss of appetite. Now waiting for possible total gastrectomy. Oncologist and surgeon unable to discuss prognosis until after surgery. It is so worrying as what little information there is about this cancer points to poor outcome.

I would welcome any advice or experiences to help him have more nourishment to get back some strength.

Thank you so much