Is it correct to say that cards reading "You may spend mana as though it were mana of any color" will not help with paying the Eldrazi/colorless-specific C portion of an Eldrazi spell?
Correct, it won't. Colorless is not a color and such effects don't allow you to spend colored mana as if it were colorless.
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I'm a former judge (lapsed), who keeps up to date on rules and policy. Keep in mind that judges' answers aren't necessarily more valid than those of people who aren't judges; what matters is we can quote the rules to back up our answers. When in doubt, ask for such quotes.
Cards that say "you can spend mana as though it were mana of any TYPE" like Dead Man's Chest can cover C costs however, for colorless mana is a type of mana.
106.1a. There are five colors of mana: white, blue, black, red, and green.
106.1b. There are six types of mana: white, blue, black, red, green, and colorless.
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