I noticed that the wikipedia page for 'block cipher modes of encryption' states, "The disadvantage of this method is a lack of diffusion.", referring to ECB mode for block cipher encryption.
From some reading, ECB takes identical plaintext blocks to identical ciphertext blocks, as long as the key does not change. (making it insecure to use in general, as illustrated with the image of Tux the penguin on the aforementioned wiki page)
But my confusion is that this doesn't seem to have anything to do with diffusion? From reading,
Diffusion is an encryption operation where the influence of one plaintext symbol is spread over many ciphertext symbols with the goal of hiding statistical properties of the plaintext. [Paar, Understanding Cryptography 1st ed., 3.1.1]
Which seems to refer to the ability of an encryption method to obscure statistical properties such as those that arise in natural human language (for instance, letter frequencies) in order to stymie probabilistic attacks on the ciphertext.
Is there some other meaning/application of 'diffusion' that I'm not seeing at the moment?