It seems like there’s a concrete error early on. The tail recurrence 1.4 is T_i + T_{i+1} = 1/(2i+1)² but in 2.12 it uses the factor (2X+3)². With the actual recurrence, K(i) does not vanish. So the zero count that forces deg K 4B+1 fails. At the extra zero at -3/2(2.16), which would win by exactly one no longer works.
The structure does not match how these results are proven. The paper mimics Calegari–Dimitrov–Tang’s 2024 proof for L(2,χ₋₃), but that proof was a deliberate capacity bound. Here the arithmetic content is replaced by a combinatorial minimization over index sets plus numerics no human has checked.
There’s also some minor sloppiness in where K=9 instead of K=0 in the definition of K and “nineteen century” typos which suggests not only was the math not proofread, but the grammar wasn’t either.
My guess is that an expert will probably find a specific gap quickly but it would be cool if I’m proven wrong.