Nah, those seems like random numbers at this point, probably. Since there are many things arleady debunked from that intro. For example, the thing him challenging the Yonko.
-The term "Yonko" appears after Roger, so BM, Kaido fimself, WB, Shanks.
-WB didn't want to make war with Kaido so neither they face each other at some point after Roger death. WB no.
-BM didn't see him in decadeS. BM no.
So he only challenged Shanks, maybe.
1 of 3.
And then in that same intro it was implied that the Yonko couldn't kill him which is false since WB didn't fight against him (not as a Yonko). Actually WB words implied that he would win and achieve the revenge for Oden.
Same with BM.
And with this last chapter it is confirmed that his skin is above average, but not that awesome, that's all. He is susceptible to blades like any other, but above average ofc since Killer and Zoro's attacks are like mosquito bites. But is not that impressive, many characters tanked good slash attacks from other powerhouses. Luffy tanked direct Rankyakus from Lucci too or Zoro only took superficial damage from Mr.1, etc.