As the Nowicki ramjet runs Mach 3-10 through hydrogen, not only the oxidiser will be heating up. Ex Rocket Man explains. To the extent Sabine hadn't already.
The ramjet solution runs into problems (in low pressure, 200 K temperature) Mach 6. If the 200 K is at 2 bar and pure hydrogen... how well does 2 bar hydrogen gas conduct away the heat? My guess is "pretty well". But if we mix this with oxygen gas like Nowicki wanted...
The XRM recommends "one shot ablatives". I think this means flakes of skin that are allowed to fall off the rocket's hull. Maybe a skin of water ice? It wouldn't flake off - it would just steam off. That's more initial mass of course but Nowicki was already allowing for that when he suggested bringing an oxidiser.
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