Your own link says the Q is to let people know it's in bankruptcy. Your own link never says the Q stays on forever. Your own link contradicts you 5X over.
The letter “Q” added to the end of a stock symbol is not a good sign for investors; “Q” means the company is in the midst of bankruptcy proceedings. The SEC warns investors to steer clear of “Q” stock, unless you’ve carefully reviewed the proposed bankruptcy reorganization plan and it looks like the company will come out of the financial trouble on top. In many cases, however, the company’s old stock -- labeled with the ominous “Q” indicator -- is dissolved after the proceedings.
The reorganized company may, in rare cases, grant some of its new stock to former shareholders of its predecessor. That stock may be worth more than the price at which its stock trades while in "Q" status. However, according to a May 2011 article in "Bloomberg BusinessWeek," only four of 41 companies that went bankrupt delivered any value of any kind to shareholders once they reorganized.
An Alternative Once stock in a reorganized, post-bankruptcy stock becomes available, any investor can buy it. Some investors avoid reorganized companies because of the past performance of their predecessors, but these stocks can rise in value if the reorganized entity succeeds in rebuilding its prior business. They can also gain value if the reorganized companies are taken over by other firms. However, not all reorganized companies do succeed, and before buying stock in any company thorough research is recommended. https://budgeting.thenest.com/q-stand-end-stock-symbol-25233.html