Correct.
What's more, Sync somehow manages to mess up the formatting of Lemmy style spoilers despite not rendering them. The correct sequence for a spoiler is a triple colon at the beginning and end, akin to the triple backtick for a code block. If you view a comment formatted like that in Sync, it will for some inexplicable reason convert the triple colon into >! ... !<, even inside a code block.
Here's how my comment looks on Jerboa:

Here's how it looks on web (lemmy.blahaj.zone):

And here's how the exact same comment looks on Sync:

I do not know what the Sync devs are thinking.