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The magnetron can have insulators made of a toxic substance that can be dangerous as a dust. This guy is just using the transformer for it's convenient laminates and primary winding - probably could have used a similar transformer with suitable current handling capacity but dead microwave ovens are fairly common. I have 3

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Some beryllium ceramics I heard...

As far as I can tell, that's a myth --- beryllia was only used in military radar magnetrons, not consumer microwave oven ones. It is extremely expensive, its other characteristics are not required, and its toxicity requires special handling measures during manufacturing, so alumina is used instead.

Only dangerous if you grind/crush the very obvious pink ceramic and inhale the dust. https://en.wikipedia.org/wiki/Berylliosis

Modern magnetrons tend to use alumina-based ceramics instead.

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