Zhou Li is the banker.
The banker is not allowed to personally enter the fray.
Professional commentary, an occupation easily slandered as deliberately cursing others, is something Zhou Li would never do, because it's in some conflict with his essential job as a banker.
So, the four characters "professional commentary" would definitely not come from his mouth. Plus, that voice was high-pitched with a hint of cheapness, and with a slightly upward inflection at the end—it was unequivocally not a tone Zhou Li could produce.
An acquaintance.
An old acquaintance.
The moment the voice was heard, Zhou Li and Tang Wan sharply turned their heads.