irregardless is a combination of letters, but it is not a word. theoretically irregardless would mean not regardless or regard. Which would mean of careful thought or consideration.
"Common sense and logic should tell you that anyone who hasn't sold during the recent drop from $7.40 certainly isn't going to sell prior to the annual meeting on June 10 irregardless of what the market does."
So the sentence would mean that mankind shareholders would not sell even as they know the market moves lower.
But the opinion that the holders will not sell, with or without consideration of the broad market probably does not matter. This is a statement of a near term bottom, and that is all.