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As per their publication, they simultaneously give you anti-malaria medication in addition to the sporozoites. Its called chemoprophylaxis vaccination. (Just learned of it today)

The article mentions that the parasites are treated if they infect the blood or liver…

So I guess they are monitoring the vaccinated closely. Honestly sounds a bit touchy.

There are other vaccines such as the polio (the one which was swallowed) which had a similar mechanism. You could even infect others with it (which has benefits for herd immunity). But the chances of vaccine-associated paralytic poliomyelitis was extremely low 1:2.700.000 (it was not given to people with immunity defects).