He just does not understand Dash you cant simply go by the Masternode server count because that is not the collateral. The sharp declines are just protocol updates  when the previous version of the software is no longer valid so the servers are not counted at that time while people update. Servers can go down for many reasons that have nothing to do with the collateral, the other day there was a DDOS attack.

Masternode count is a good long term indicator but a poor short term indicator. I guess he may be trying to scare newbies.

Also, people may choose not to run nodes for other reasons like to go lend in markets or just to hold.