Similar to his work with Sweden in 2018.
That said, it clearly isn't working universally - Dimitrova and Hristova were very similar talents coming through youth and juniors, Dimitrova was if anything slightly better before Pichler came on board, but since then she's stagnated horribly while Hristova has improved drastically (she was already improving clearly before this, but this is another level on top of that entirely), while Todorova is one of those "on her day she can do it" types who was very quick as a junior and had both World Cup and World Championships top 20s all the way back in 2019-20. And at least she has World Cup podiums from last season, 7 top 10s in all and a LOT of results from 11th to 20th that make her at least a reasonable outsider to have been that close to a medal compared to some. The timing of it is questionable to say the least, and she's Vladimir Iliev's partner as well for whatever that's worth.
Curiously, Hristova as a youth competitor and in her U20 year - so before Pichler joined the Bulgarian team - was very good among her contemporaries. She was beating the likes of Andexer, Fichtner and Kirkeeide at the Salt Lake City Junior Worlds back in 2022 (although she was DQed from the sprint), part of the Bulgarian bronze medal relay (with Dimitrova and Popova), and took two medals at the Madona Junior Euros in 2023 ahead of the likes of Michelon, Richard (the two French women being a year older than her too), Andexer, Puff, Tannheimer (albeit Tannheimer is two years younger than her), Fichtner and Bondoux. You would expect the greater resources to bring the top teams' athletes ahead of her by now, and indeed Michelon and Kirkeeide are clearly stronger athletes over the course of a season at this point in time, and although they've been disappointing at these Olympics, so are Grotian and Tannheimer. Of the four women that beat a three-miss Hristova back in 2022, only Iva Morić has failed to become a World Cup regular, and that's largely because she hit 20/20 in that race, her ski speed stopped her from progressing in the German team and she's switched to representing Croatia.
Pichler's getting them to peak like this - especially after not racing since Ruhpolding - may be suspicious, I recall a lot of eyebrows raised about Hanna Öberg and Sebastian Samuelsson back in 2018 too. A 20/20 Individual is, and remains, the most likely way for such an outsider to score a medal, but in my opinion Lora Hristova isn't even the most surprising Individual podium this season - I think Leinamo was more of a shock. Last year at the World Championships Hristova was 13th on 19/20, and would have been 7th with the full house. In Östersund she was 23rd in the Individual on 18/20, and would have been 7th with the full house. This time she hit the full house. Julia Simon won the Individual in Lenzerheide '25 on 19/20 and Lora Hristova was +2'30 on 19/20. This year Julia Simon won the Individual in Antholz on 19/20, and Lora Hristova was +1'04 on 20/20 - so she improved her time relative to Simon by only around 26" over 15km, so overall it's not quite as eyebrow-raising as it may seem from the surface.