He’s right on with this statement.
“Conscience” as understood by a number of Catholics today, is an excuse to dissent from Church teachings. This false idea of conscience can be traced back to the 1960’s when so many theologians disagreed with the Pope about Humanae Vitae and devised a reason to do it. Before this time, you won’t find any Catholics who used the noble idea of conscience as an excuse to dissent from Church teachings or as a rationale to explain away their sins.
The false idea of conscience, embraced by some Catholics in the modern world, is a very wimpy, anemic force. It doesn’t make any hard demands and urges them to just go with the flow. It saves them from the hard work of conversion and renewing their minds in truth.
The classic, noble idea of conscience is a very different thing. It makes demands on the faithful. Real conscience is what leads one to become a martyr and/or a saint.