Indulgences were and are guarantees signed and sealed by folks in no position to deliver on the promise. Indulgences were sold by those who had invented the idea of purgatory in the first place (there is no biblical basis for purgatory).
This guy here doubts two elements of the Catholic faith, and broadcasts this to his allegedly Catholic audience. He not only denies Purgatory, he also denies that the Church's Magisterium was given the power to bind and loose.
In short, this man is not a Catholic.
SD
What is the biblical basis for purgatory?
Purgatory was defined by Catholic Tradition, which makes it binding on Catholics to believe. But you won't find anything about it in Scripture.
And belief or non-belief in indulgences is indicative of nothing. I would wager half of today's Catholics don't know anything about them, except for Luther's railing against the selling of them, nor have 95% of Catholics tried to obtain an indulgence.
Are these folks not Catholic either?