I'm very interested in it too, there should be something that Jakub noticed that makes him think this way, very interesting statement.

I'm just thinking to make any correlation between better immunity, lifespan and aestivation you should have 2 huge control groups that have identical or almost identical genotypes, keep them in exactly same conditions starting from egg, feed exactly the same, maintain same activity level ( no breeding). And record all findings through their all life, so the whole process might last 20+ years... But how interesting it would be!