Yeah, it's not a very good animation. I think the latter part of the animation is trying to express the long (year and a bit) post-eruption "high" brightness state seen in the 1946 eruption as some effect of irradiation of the primary by the secondary, but it's not very clear.
Before I was born Bob Kraft explained how T CrB works, and it is not like that animation.
I think ideas have got considerably more detailed than that, with another half-century of work. But yes, the basic idea of accumulating mass onto the surface of the white dwarf remains the same. But - are the stars tidally locked? Does the material land on one point on the star's surface, or is it spread around it's equator? Or further, if their spin axes aren't aligned, and they mutually precess?
Harvard ADS need a better OCR engine for their archive. I had to go back to the PDF to make sense of the linked page. Hmmmm, "
There is no evidence that the 1946 outburst
affected the orbital period.
" That puts quite a stringent limit on the total amount of mass transferred across the 1946 eruption. Or rather, the amount which transferred, less the amount blown away in the eruption.