Slobodkin's experiment does not demonstrate panspermia. That's it. It only proves what you said: bacteria can survive entering the atmosphere. Even if you may need this for panspermia, it does not imply panspermia.
PS: there is no need to bite, we can just talk. This will be fine ^^
I agree, it doesn't demonstrate panspermia - I didn't say it proved it, just supported it. It certainly makes it more probable - see my answer to justtryme90 below. Are we arguing about words here?
It's the weight of convergent supporting 'evidence' or ('data' if you prefer) that's starting to tip the likelihood of panspermia as a realistic explanation for the phenomenon of life on Earth. Isn't this sort of consilience the main thing that holds up the theory of evolution itself?
Anyway, don't worry about biting - just a figure of speech! Have had a quick look at your blog and can see you have an aversion to vampires (Dracula anyway)! :-)