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Is that valid? Will it work? If not, what do you see wrong?
About the "noindex" directive no worries. It is unofficially supported by Googlebot.
Thanks in advance for your kind support,
I don't understand why you are trying to compress your robots.txt file? It seems you are trying too hard to save a few kb.
I would worry more about making sure the robots.txt is accessible & understandable to search bots. Search robots can get easily confused. Your robots.txt should be formatted exactly as the search engines request if you want to make sure the robots follow your instructions.