Hello:
... don't think it means what he thinks it means.
No, not in English:
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dispositive - adjective
law US specialized
uk: /dɪsˈpɒz.ə.tɪv/
us: /dɪsˈpɑː.zə.t̬ɪv/
deciding a matter finally, or relating to the process of doing this:
No single factor is ordinarily dispositive.
The surveyor left off the original boundary lines, and that proved to be the dispositive fact in this appeal.
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The chap is German, but in French (eg: dispositif), in Spanish (eg: dispositivo) and probably other languages with the same shared roots, it can also mean device or machinery, etc.
O.
