That's correct, I've also added some ALPRs to OSM; which is why I decided to check it once more. There's other websites, which also render ALPRs (alongside other surveillance POIs) on a map. However, DeFlock's is the most clear for ALPRs in specific, at least for what I've seen, and also providing information on the subject. I simply noticed it being offline, and figured it might be relevant to the community.