I don't think Napoli will try to hire Josè Mourinho, JM has a very high salary and in fact he is the second highest paid coach in Serie A, and Napoli already have two coaches under contract, Rudi Garcia despite being sacked still receives his salary from Napoli, and Walter Mazzarri who is the current coach. I doubt that De Laurentis will try to sign Mourinho at the end of the championship, it's mostly clickbait news
I agree, look like it is impossible for Napoli to make Mourinho as their coach at this time. Indeed, currently Mazzari does not have an official contract and is only an interim coach at Napoli. However, this is not a reason for Napoli to appoint Mourinho at this time. After all, Mourinho has failed at AS Roma and he is almost done in 3 seasons, on the other side this season Napoli is also in bad performance. So, it doesn't seem they will bring in Mourinho right now.