I believe it is indicating that the child lock is only 85% effective.
How the hell they arrived at that number we may never know, but I’ll bet you it’s buried on page 4,987,253 in clause 6, subsection 8 of European Union Product Safety Report 156.421a. Or something.
Ah, the classic sad onion.
May be something related to child resistant packaging. From the CPSC FAQ on the Poison Prevention Packaging ACT “For a package to be child-resistant, at least 85% of tested children must not be able to open the package during the first 5 minutes of the test”.https://www.cpsc.gov/FAQ/PPPA
Tintin in jail 85% of the time?