It didn't sound convincing to me too and I know how well most of these journalists and sports page on the media love to cook up stories for clicks so I had to check it out on Fabrizio's to know if it's legit but couldn't find any recent post from him about Lunin, but Yahoo sport says that Kepa could be considered in case Lunin leaves during the summer transfer.

 I don't understand why Real Madrid would want to replace him after extending his contract last season, maybe they want to use him to generate more funds or his agent Jorge  Mendes is trying draw the attention of other clubs so Lunin would secure first choice keeper position, he's the second choice to Thibaut Courtois and might likely wants to be played often but it won't be possible at Real Madrid since Courtois is still available.