The online article indicates (via the footnotes) that:

• The first quote is from Karl Rahner in Dialogue, p. 271-272.
• The second quote is from Karl Rahner in Dialogue, p. 272.
• The third quote is from Karl Rahner in Dialogue, p. 135.

Karl Rahner in Dialogue: Conversations and Interviews 1965-1982 (Crossroad Publishing Company, New York, 1986), ISBN 0824507495.

If anyone has access to a copy, we can settle this pretty quickly.

Our library has it. I'll see if I can get to it tonight.

I think this would be better off in the Lyceum.

So, did you find anything yet, Geoff?

No, but I have thought about looking

Karl Rahner was a neo-modernist and spouted pernicious errors throughout his impious career. He is, not surprisingly, a darling of the conciliar church. Wherever his work is respected and propagated, catholic doctrine is inversely unhinged and degraded.

I didn't compare the quotations word for word. The first is substantially accurate, although he did preface by saying he was in an awkward position.

The second is also substantially accurate, although it seems to me that he did not use the word "must".

I could not find the third quotation on the cited page.

All were taken from interviews, which make explain their relative lack of obscurity and pedanticism.

No argument from me.

Nor from me.