Like in all his previous posts, Stevie makes an assertion not backed by him by any evidence or sources. For example, where his cartoon says that these ice-chunks “are not airplane discharge”, that is simply an assertion without a source showing proof. It is similar with his earlier tektite argument: an assertion, not backed by sources, while plenty of (scientific) sources that disprove his assertion actually exist.
That is the mark of the ideologist, not the scientist. You see it in cults