There are a lot of claims without any evidence in that blog post. "The RNA in a cell is the only entity which is active and carries significant bit density." is one of them.
DNA certainly encodes for a significant amount of information as well. And why not proteins, there are a lot of proteins in a cell and you can also modify them in various ways. A cell has an enormous amount of state, any of it could theoretically store information like memory. There are a lot of different molecules active in a cell, in various modification states, at various locations, and all of that could encode information.
What this blog posts doesn't provide is any experimental evidence, this is a pure thought experiment. If RNA were to actually store memory, that would be great. Because determining the RNA sequences inside a cell is something we can do.
mRNA and tRNA move, so "active". Ribosome is also (re)active, and "the ribosome is itself composed of both RNA and protein, likely reflecting its own descent from an RNA world." [1]
[1]: The Ribosome Moves: RNA Mechanics and Translocation
DNA certainly encodes for a significant amount of information as well. And why not proteins, there are a lot of proteins in a cell and you can also modify them in various ways. A cell has an enormous amount of state, any of it could theoretically store information like memory. There are a lot of different molecules active in a cell, in various modification states, at various locations, and all of that could encode information.
What this blog posts doesn't provide is any experimental evidence, this is a pure thought experiment. If RNA were to actually store memory, that would be great. Because determining the RNA sequences inside a cell is something we can do.