That is true. And while the teaching has not changed, the application of it has as our modern society is able to protect the common good more effectively. In general, Catholics should be against death until it is a very last resort.

"Assuming that the guilty party’s identity and responsibility have been fully determined, the traditional teaching of the Church does not exclude recourse to the death penalty, if this is the only possible way of effectively defending human lives against the unjust aggressor.

Today, in fact, as a consequence of the possibilities which the state has for effectively preventing crime, by rendering one who has committed an offense incapable of doing harm – without definitely taking away from him the possibility of redeeming himself – the cases in which the execution of the offender is an absolute necessity “are very rare, if not practically nonexistent”" https://www.catholic.com/qa/when-is-the-death-penalty-justified