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I believe this is true. AFAIK the purpose of obfuscation not only helps protect your product but also protects GMS and its HTML export. Being able to disable it completely would defeat that. Of course obfuscation offers limited protection in both cases and if you really want to decompile/deobfuscate it, you can, with effort.
But I may be wrong. Perhaps someone can provide a source with a definitive answer.