He cited with particular interest how some lenders are counting as income interest accrued but not paid.
We have to group the words in the sentence to understand it. He cited with particular interest. [fact.] The fact is "Some lenders are counting as income interest accrued but not paid." To say it another way, some lenders are counting interest (that is accrued but not paid) as income. If we say "We are counting as (noun) (other noun)" it means something like "We are including other noun in our group of nouns," e.g., "We are counting as Europeans people with Russian citizenship."
To the content, it's a risky play because this income hasn't yet been paid and still carries the risk of not being paid, so to count it as income is a bit premature and can inflate income totals and thus things like financial leverage/lending power.
Hope this helps.