Yes, strategic voting can be a concern in score voting… but not a 2PD level concern. When all voters are strategic in score voting, it degrades to approval voting, and when all voters are strategic under approval voting (under reasonable circumstances) a Condorcet winner will always win.
Obviously, this is assuming that everyone is maximally strategic computers. The real question is, what happens when voters just think they are being strategic. If a significant chunk of the electorate think that bullet voting is the best strategy, then they would vote under honest plurality voting, which is very differently then strategic voting and such voters may actually get rid of the 2PD even faster then normal approval or score voting because candidate cloning makes honest plurality elections very unpredictable and increases the likelihood that less mainstream parties will win. Thus while strategic voting may be a concern in approval and score, it is not a 2PD concern.