Yes... The blithering buffoon really did claim he could "smell cancer and even how far it is advanced". He did this while posting a link to a BBC News article about dogs that had been trained to 'sniff out' cancer. Of course this is nothing other than a fantasy brought about by Loony Lenny's "Ooh... That sounds clever... I'll say I can do that too..." attitude to reality.
Given that he already has the face of a rat, the eyes of a pig and the brain of a newt I suppose the nose of a dog would be appropriately chimeric but let's see what wikipedia has to say on the subject of a dog's sense of smell...
"While the human brain is dominated by a large visual cortex, the dog brain is dominated by an olfactory cortex. The olfactory bulb in dogs is roughly forty times bigger than the olfactory bulb in humans, relative to total brain size, with 125 to 220 million smell-sensitive receptors. These receptors are spread over an area about the size of a pocket handkerchief (compared to 5 million over an area the size of a postage stamp for humans). The percentage of the dog's brain that is devoted to analyzing smells is about 40 times larger than that of a human.
https://en.wikipedia.org/wiki/Dog_anatomy#SmellConsequently, it has been estimated that dogs, in general, have an olfactory sense ranging from one hundred thousand to one million times more sensitive than a human's. In some dog breeds, such as bloodhounds, the olfactory sense has nearly 300 million receptors and may be up to 100 million times greater than a human's"
Obviously somebody had a word in Loony Len's shell like and told him posting such idiotic drivel makes him look exactly what he is... An idiot who never thinks before he mashes the keyboard with two of his pudgy little fingers.. So he rapidly deleted the post.
But... You can see a screen grab of the post in question... Here.