He did play a couple of seasons in Italy for Sampdoria in the eighties, so he would have been familiar with Serie A. However, Torino were in Serie B at the time. Souness had no idea about that, hadn't learned enough Italian despite living there for two years and hadn't done any research before...
Souness was doing the standard 'Why aren't British managers given a chance?' grumble. His questions were pointedly about how De Zerbi is going to know anything, given that he's never managed in the Premier League. When asked who he would suggest, he had nothing. He might want to consider that...