True. What do Catholics think about Melchizedek? I'm not familiar with that. My view is that he might have been a Christophany.
Discussion
From what my Catholic friend told me the food he gave Abraham was Jesus' transubstantiated body. I'm not sure who they think Melchizedek was, but that demonstrates that they think Jesus' physical body can travel through time and violate causality.
Yeah, I've heard of the bread and wine that Abraham and Melchizedek shared being called "communion" or the Eucharist, but of course since Catholics believe it is Jesus' actual body that would make for some weird theology!
The only take on Melchizedek that I'm familiar with is that the bread and wine were a prefigurement of the Eucharist. I haven't heard anyone say it was itself the Eucharist.