OFB-12

Let me repeat myself. The regulations for chess tournaments state: "The draw and calculation of coefficients are performed in the Swiss Master x.x program," and that's it! That's all! If someone wants to know how this program calculates things, let them figure it out. If you come to participate in a tournament, it means you agree with everything. If you don't agree, don't come. No one is going to coddle anyone.

I'm not arguing with this approach; just include it in the regulations, and everything will be fine. No one will have any questions.
Currently, the regulations only state that in case of a tie in points, additional criteria apply, and the first criterion is the Buchholz coefficient. How it is calculated and which program is used for this tournament is not specified in the regulations, so we need to Google it.
For example, Wikipedia provides the following definition: "The Buchholz coefficient of a particular participant is the sum of the scores of all opponents with whom the participant played, regardless of the results of the matches between them. The idea is that a participant who played against stronger opponents (opponents who scored more points in total) is awarded a higher final ranking. All unplayed matches (+/-) are conditionally considered draws."
In this definition, there is no mention of half a point. For example, with twaryna's Buchholz coefficient, it doesn't matter whether he actually played against Dust_HL or not; the result of the game is recorded – it's a technical loss for twaryna, so Dust_HL's points should be included in the calculation of twaryna's Buchholz coefficient.
In my opinion, it's all simple, and there's no need to overthink how the program calculates half a point when it can be calculated manually.