“The rav is saying he personally
discourages Internet use. However, if one is already in a position where
they need to use the Internet, (for parnassah or school, for example)
they might as well use it for good by listening to shiurim.”
Your logic here is absurd. If someone needs internet for parnassah or school, they should use it for that and no more. Why should they stay on the internet longer to also use it for shiurim? During the time they don’t need it for business or school use they should be no different from the default psak, which is to not use internet even for torah.
Rather, he means for those who are already freely using the internet, despite the psak not to, to have torah available to them as an alternative to non torah. See my moshol above.