Not wrong, but imprecise.

The wafer doesn’t become only Christ’s body or the wine only his blood.

The whole Christ—body, blood, soul, divinity—is present under every particle of both species.

What’s more, this presence is non-local and non-distributed. This gets…technical. https://twitter.com/richarddawkins/status/1381112700051202053

Specifically, Christ in the Eucharist is “not present as in a place,” according to Aquinas, or “not locally present,” per Cardinal Newman.

Only in heaven is Christ’s body “locally present” or “present as in a place”; his mode of presence in the Eucharist is “nonlocal.”

What does “nonlocal presence” mean? To approach this idea, here are some practical implications:

1. When the priest elevates the host, Christ’s body is not elevated in space. You can move the host around as much as you want, but Christ is not moved in space.

2. Christ’s body is not spatially distributed in the host (“after the proper manner of dimensive quantity” in Aquinas’ language), as locally present bodies are distributed in space. Rather, the entire Christ is fully present in every particle and and every drop of the species.

3. As a direct consequence of this non-distributed mode of presence, when the priest breaks the host, Christ is not broken. And, of course, when we chew the host, Christ is not mangled.

4. Also, obviously, twice as much Eucharist is not twice as much Christ. Receiving both the host and the chalice gives you no more Jesus than if you receive only one or the other. Half a host, or any fraction of a host, or two hosts, are all exactly the same: the whole Christ.

Much more about Eucharistic theology, for whomever may be interested, explained with conceptual tools borrowed from (but *not* demystified by appealing to) quantum physics, speculative physics, and SF/fantasy concepts https://www.ncregister.com/blog/tesseracts-wormholes-quantum-physics-and-the-eucharist