(Interestingly I don't see this... are you on a non-retina display and which Safari/macOS version are you using?)
Regardless, I would expect it. You're using "zoom contents" for the flexible layout option, presumably because otherwise the SVGs would not scale at all since only their bounding contents change size. Zoom contents uses CSS Transform's scale method. When using a 3D transform, it puts the image at its current size on the graphics card as a texture, and then will resize it as an image with interpolation instead of re-rendering. Non-3D elements get re-rendered for their scaled size and will look sharp.
Now the fun fact is Hype typically will use 3D rendering for all elements as a performance enhancement (when the default 'Use WebKit graphics acceleration is on), but if it detects that you are trying to use zoom scaling or the scale option, then it will disable for those elements. This causes it to go down the re-render path and it can make text (and SVGs) smooth. (Not to insult a dead person, but Edge Animate always used the 3D performance trick so these would always be blurry with its output, whereas I took pride in being able to solve this for a lot of cases with Hype .)
Does not using a 3D rotation solve the issue?