From the article, it says Teaser Bet is a type of parlay bet. With that said, I don't think there's any difference between Teaser bet and Parlay Bet because it's just a different name for it, same thing about Multi Bet because it's basically a combined bet that allows you to get bigger odds. Because I think sports betting is only about single bets and parlay bets/teaserbets/multibets, although there are many options that we can choose in sports betting, but it is only limited to two types of bets, about single bets and parlay bets, because based on the article you included also said Teaser Bet is a type of parlay bet. 
It is true with the statement, if Teaser is a type of parlay bet but there is a slight difference that I found, namely in the chances of winning and the payout, where the chances of winning for teasers tend to be easy while for parlays it tends to be difficult, and with different payouts with teasers which are relatively small and for parlays are relatively larger. maybe some people are only familiar with parlay type bets because in my opinion this is a type of bet that is indeed widely done.While for teasers maybe only a few people know about it and make bets like this. If indeed compared I think parlay is the most widely known by people, because this parlay is not only done in terms of gambling but in other things it can also be done.