Viral Marketing is the name of the game. It is a creative, well-thought and intentional attempt of the company / advertiser to make a buzz in social media. It appeals to people's ideals and emotions - eliciting reactions and poking fun. When more and more netizens engage themselves, it leads to a massive online conversation with thousands of likes, shares, comments and uploads.
This strategy when well-executed becomes effective - allowing advertisers and companies to reach their marketing objectives (raise awareness, increase demand, attract customers, improve sales, augment revenues, etc.)
PureGold's recent post has gone viral because it features one of the challenges brought by the pandemic; i.e. rules on who are allowed to go shopping - age as the criterion.
The buzz will continue to draw more reactions and without people knowing, they are already buying products inside PureGold stores because the brand has reached their choice heuristics, top of mind awareness, curiosity, etc. 
The next time you see an erroneous content of an advisory, think twice Companies like Puregold have their proofreader, top management and employees who are grammar nazis, and simply, creative advertisers 
Companies like Puregold have their proofreader, top management and employees who are grammar nazis, and simply, creative advertisers