QuoteThe Ryzen 3 4300U is only -9.41% behind in the multi-core test, which is surprising considering the generous IPC gains one can expect from Zen 3 parts over Zen 2 SKUs
Actually it isn't because the 5400U isn't a Zen3 chip. It's still Zen 2-based. So your article is wrong there.
According to AMD's own charts at the introduction of the 5000U Family they only showed a 3,7% gain in single core Performance of the 5400U over 4300U. So these results here in reality top them. The regression in multi core performance is however surprising (and a huge disappointment if it turns out as real): it was supposed to be 25% up.