In my opinion, this is an attempt at smearing a better cryptocurrency competing for the same recognition: true anonymity.
It could very well be the tip of a broader, coming attack. The developers of other cryptocurrencies are spending money for marketing and acceptance into exchanges, Monero is not.
They are willing to grease the wheels to success while Monero grows organically instead. This may or may not be a problem for Monero. If they run a smear-campaign on Monero, they could win with their inferior cryptocurrency.
There is a much better/detailed response to the claims made in the paper on Reddit:
https://www.reddit.com/r/Monero/comments/65pon8/monero_linka...