It looks like the author either confused about this argument, or are refuting an argument I've never heard.
They're refuting the argument that each and every letter should be pronounced according to the word it represents. Their take on pronouncing 'JPEG' makes this the most clear; they believe if this argument were true then 'JPEG' would be pronounced 'JEG' due to the silent/'F' sounding 'P' in 'Photographic.'
Honestly, I've never heard someone argue this, and it's a bit ridiculous for all the reasons the author put forward. I've heard this argument for just the first letter ('Graphical' > hard 'G') before which, as you pointed out, fits every example they've given.
They're refuting the argument that each and every letter should be pronounced according to the word it represents. Their take on pronouncing 'JPEG' makes this the most clear; they believe if this argument were true then 'JPEG' would be pronounced 'JEG' due to the silent/'F' sounding 'P' in 'Photographic.'
Honestly, I've never heard someone argue this, and it's a bit ridiculous for all the reasons the author put forward. I've heard this argument for just the first letter ('Graphical' > hard 'G') before which, as you pointed out, fits every example they've given.