Spoiler: The twitterer thinks not.
... does this mean that second infections were just as bad as first ones? No, not at all: Because some of those second infections *already had Long COVID*
(Actually, in classic academic fashion the authors say that a limitation of their study is that you can't really apply the results at a population level, and then immediately apply their results at a population level.)
... most of the population-level evidence suggests that both acute and long-term symptoms are much less common the second time around for both children and adults.