Yes, you have a solid tumor. (Anything that's not a leukemia or lymphoma is a solid tumor.)

I think the only issue in your eligibility for Enhertu right now is whether you have technically failed the first-line carbo/taxol/Keytruda chemo. Having some tumors that are growing doesn't sound good to me, even if others are shrinking. But I'm not a doctor. Was there a long gap between your previous scan and when you started chemo? Then maybe they're thinking that the growth occurred before you started chemo?