It's nothing really interesting in the first place, especially because of the fact that with Lightning Network, transactions are settled off-chain and instantly already. I can't think of anything that can beat off-chain transactions in any shape or form. On top of that, PayPal could even just use its own global centralized ecosystem to allow user and merchant to settle transactions instantly. At the end of the day, PayPal is just looking to exploit crypto's increasing popularity to boost their fee income. Never will they just do something without any financial motivation behind it, especially so with greedy share holders looking for an increase in operational results. PayPal doesn't give one single damn about crypto transaction times....
I wouldn't be so dismissive. Lightning Network testing is going well, yeah, but it hasn't been tested for widespread use. There's no definitive best solution yet. If something ended up working better than the Lightning Network, it should be embraced; Bitcoin will be left behind in the dust otherwise. The more parties there are working on solutions, the better it would be for the end users.
Also, innovation is always good because it can spawn and spur more innovation. Even if this failed, the concept and tech could be used for something better in the future.