The claim that things-in-themselves are 'not in space' thus smuggles in a substantive characterization of what Kant's own critical constraints forbid us from characterizing at all.

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Critical constraints(rules about the proper boundaries between science and religion/theology): Limits or boundaries that Kant believed philosophy and science must respect to stay legitimate—basically, rules about what kinds of claims are valid and what should be kept separate.
Kant(as used in epistemology and metaphysics): Immanuel Kant (1724-1804) was an influential German philosopher who argued that our minds shape how we experience reality, and that we can only truly know things as they appear to us, not as they are in themselves.
Smuggles in(argumentation and logic): Introduces something quietly or without acknowledgment, making it seem innocent when it's actually a controversial addition.
substantive characterization(used to describe what is forbidden in the statement): A detailed, meaningful description that actually tells us something specific about what something is like.

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