Na`Vi are missing PGI because of the ESL rules?

A few days ago very upsetting news for all the Na`Vi squad occured - the squad would not be able to participate with its full roster at this year main event. This upsetting news was shared with the community by the GLL vice-president Simon Sundén in his twitter account:

I hope you all understand how serious this is.
One of the best PUBG teams in the world: @natusvincere cannot even qualify with their killer squad because of the rule that you have to be 18 to participate for the PUBG Global Invitational. It's ridiculous.

— Simon Sundén (@joinsimon) April 30, 2018

One of the Na`Vi powerplayers Shade1 is only 16 years old at the moment so due to the game restrictions in Germany (18+) he is forbidden to play it. However the squad has been swapping one player throughout the last few months with pretty successfull results so probably there would be no problem for them to win a CIS quota.