In his words, he completely ignored the Collector.
Just kidding.
If it were anyone else, he might not be sure, but if this new future Collector is anything like the one on Timeline One, then he is almost certain that this guy's remarks were just aimed at getting more antiques from him.
Because a Collector is not a merchant.
In front of antiques, he doesn't care about some gains and losses in terms of value.
As he said, the antiques he fancies are priceless treasures to him!
What's more.
Even if he's wrong, it doesn't matter. Can't get C9 devices, then go for C7, C6 ones, as long as they're stronger than C1. If it still doesn't work, trade some other things and take them to the Collector of Timeline One in Gus Land for transactions. It's all the same.
With two future timelines in hand, there will always be a way if you want to find one.
In short, Shen Shi remains the same as at the start of Timeline One.