He's talking about a scenario in which Lonzo is $20m+, as he just confirmed in his last comment.
Can I see Lonzo being a good player next to Zion? Sure. Can I see him being good enough justify that kind of salary at this stage in a rebuild? No.
You can't ask the question ''will Lonzo be good'' in a vacuum, cause it's not really the question that's on hand. You can't pay Lonzo ''big 3 player'' money because he is not that kind of player. He's a good auxiliary roleplayer, in his best form. It's worth paying for that if you're a good team trying to keep the band together in deep playoff runs with championship aspirations. It's not worth paying that to keep an actively bad team together.
You sign Lonzo for $20m or more now only if you think he's going to be not just good but 'third best player on a contender' good. If you don't think that, and you actually think he's more like the 4th or 5th best player on a contender (which I think is the more realistic scenario) but you pay him 3rd banana money anyway then you hamstring yourself later on: suddenly when it's time to actually get that 3rd guy, you don't have the money or you don't have the flexibility or they end up potentially stuck behind your overpaid guy because you can't exactly play your $20m+ guy as a bench piece in most circumstances.
None of this is news, it's basically the argument that Shamit lays out in the article I posted. How many bad teams can you think of that backed up the money truck for a roleplayer ended up with that paying off? I can't think of many. How many bad teams paid too much to retain their guys that they 'couldn't afford to lose' and ended up regretting it? The list is endless.