Do addresses that have received BTC count as "dormant addresses" as well though, or is it just addresses that have not made any kind of txs in a while?
Just in case you confused, note that in the article what is defined as "dormant" are the accounts on the exchange platform that were inactive for a while, there is no mention to addresses.
But to anwser your question a BTC address is considered dormant despite the fact it receives transactions. See for example the
Top Dormant for 5 years Bitcoin Addresses and the last in dates. What matters is the last TX out