English Wikipedia has a pretty short hard fact summary of his life, and that's probably for the best - the only hard fact I think it's a bit of a pity it leaves out is that he also tried (and I think successfully) introducing the use of radiotelegraphy for communication in (Czech) mines. Hard fact, because I found period newspaper mentions of it.
https://en.wikipedia.org/wiki/Otakar_Batli%C4%8Dka
Whatever you think of his life, the indubitable hard fact that everyone respects is that he's a hero of anti-Nazi resistance.
When it comes to his literary legacy, it's a lot muddier, and the mystifications really didn't help.
And yes, of course, this is more of a personal confession, an English blog post won't change anything.
But, having grown up reading and loving his stories, and having now read them as an adult and being possibly even more impressed, it annoys me that the attempts to puncture the myths surrounding his life and finding the truth (admirable though that is in and of itself) have completely overshadowed his actual body of work, which I think is still just sort of lingering in the "children's literature" category that, if ever analysed, is only analysed through those lens.
Personally I think a lot of what he wrote actually isn't children's literature per se. The stories are very short and written in relatively simple language and laid out in a clear economic manner with fairly clear cut moral standards, and yes, some are playing with some typical tropes of the time (probably an inevitable result of frequent regular magazine writing)... which I guess successfully hides the fact that... well... he manages, in some very short concise stories laid out in a clear economic manner to touch upon a lot of BIG, pretty adult themes.
Like colonialism.
Economic colonialism.
Moral grey zones.
The hopes and struggles of European imigrants in the Americas.
The inevitability of death.
And it really, really fascinates me how he manages to distil these themes into short, concise, exciting stories with a clear (though rarely explicitly stated) moral code without somehow in any way taking away from their complexity.
And I bloody want to know how on Earth he does that!
(I think the only true answer is "by being a whole human being". But I would still love someone to actually take an academic stab at it instead of continuing to let the conman who stole his legacy overshadow it.)