Nonsense. It is only a real word by virtue of the fact that people use it. By that definition, ALL the terms above are “real words”. If one want a language that is consistent and noncontradictory, an unnecessarily confusing, you can NOT add any old prefix and suffix to a root you want, regardless of its meaning, and create words that are at odds with those meanings. The prefix ‘ir-’ negates the root. As does the suffix -less, so *irregardless would mean “giving regard to”, the exact opposite of what Merriam Webster claims it should mean. This level of disregard for word meanings does not serve to make the language clearer or more expressive, it only serves to make it more confusing and muddled.