Exactly. The image does not lie. Zoro gets more recoil from exchanges with S-hawk than Blackbeard does. Blackbeard was not even moved, or pushed back.
I already saw a stupid post like that on Twitter, some guy claiming this means Zoro is Yonkou level. I could not tell if he was a troll, or simply a delusional ex-ZKK type of guy. But it reminds me of those toxic types who can't hype up their favourite character without trying to take down some other character instead.
Clearly some people misread Blackbeard's reaction. Yes, Blackbeard was disturbed.
That does not mean Blackbeard was scared for himself personally. BB obviously is confident of himself in this clash, but was probably worried that these powerful new Pacifistas endangered his other crew members and captains who are not exactly on his own level.
To add further to this, it is not unreasonable to infer that Blackbeard was surprised the WG had come this far in the Pacifista project. The deployment of the Seraphim was a recent event. Perhaps before this he had heard rumours, but it is a different thing when you suddenly encounter them in person, and also notice they have varied genetic traits: Devil fruits, fighting styles and bodies, of former Warlords, also Lunarian traits.
Clearly they were created to be living super-weapons, with the WG just selecting what they felt were the strongest traits. They are a genetic experiment with questionable ethics. I am sure the question of lifespan will come up at some point too, for there may indeed be consequences for these clones.