I think it definitely still happens... For instance, at expiry... stocks (and also the index-level) can be pushed on a certain strike where there's large interest. There's a bit of manipulation going on there...
Said like a true Troll! tsktsk... I see your profile is limited as well... no need to say more... bye...
This is a different study, done by Finnish professors, and it also includes an advice for retail traders: https://www.wsj.com/articles/how-funds-distort-the-stock-market-with-month-end-trading-1428375831 "Because the pattern is so ingrained, investors can profit with this recipe: Buy shares three days before the end of the month and sell them three days into the new month, he says." "The patterns described in the paper aren’t a secret among fund managers, and some try to time fund purchases and sales to take advantage of it, including Source Morgan Stanley Europe MEMO Plus UCITS ETF."