This makes sense on the surface, but my issue with it is that it hand waves the schema formation process. Forming conceptual understanding is not merely an automatic function of gaining enough facts. Saying "understanding relies on memory" is not the same as saying "learning is memory." The first is well backed up by the research, the second is a logical leap. The word "well connected" in the second sentence of this tweet is doing a lot of work. (Unless, as I have said elsewhere, we mean something different by memory. If memory means any change in the brain, then yes, of course, saying learning is memory is a tautology. But if we mean the colloquial definition, that memory consists of facts you remember, then this statement goes far beyond the research.) The processes by which we form complex schema and develop our own ideas are often different from the processes by which we learn isolated facts. We need both.