In passive POE there is no handshake procedure... so no POE classification...
Mikrotik PoE documentation
Passive PoE-Out up to 30 V - PoE standard, which does not require negotiation between PSE (Power Sourcing Equipment) and PD (Powered Device). For PoE-out uses the same voltage as supplied to the PSE (Power Sourcing Equipment). PoE-Out Standard for devices which supports input voltage up to 30 V. PD resistance on spare pairs should have range from 3kΩ to 26.5kΩ.
(text for passive PoE-out up to 57V is essentially the same). The highlited part indicates that passive PoE-out doesn't blindly enable power, instead PD still has to offer certain (static!) characteristic. With 802.3 af/at/bt/... that characteristic is dynamic (i.e. resistance changes with time) to negotiate power class of PD and is as well explained in the link I posted in previous post.
Since even passive PoE PD needs to show certain characteristic and gigabit kaptop doesn't, that laptop still needs its own power adapter to fry itself.