No. Really, I’m not.
The catechism is on-line. If you’re going to quote it, please quote it in context. Proof-texting with snippets never works:
"Baptism is necessary for salvation for those to whom the Gospel has been proclaimed and who have had the possibility of asking for this sacrament. "
The logical implication is that, for one “to whom the Gospel” has not “been proclaimed”, or who has not “had the possibility of asking for the sacrament”, baptism is not necessary, per se.
“The Church does not know of any means other than Baptism that assures entry into eternal beatitude”
In other words, baptism is about “assurance” of salvation. Yes, we are assured of salvation by following the path that begins with baptism. However, others exist. Namely:
“God … himself is not bound by his sacraments.”
In other words, God may save outside of baptism.
End of discussion.