The structural description in the evidence suggests that it should look like ⿰日淫.

I agree with the comment. Structurally, 淫 (dâm) is a better phonetic than 滛 (phonetic "dao"), but if you see here (https://hvdic.thivien.net/whv/滛), many Vietnamese dictionaries consider the two to be equivalent. Here is another example where phonetic 滛 has a reading based on 淫

Prof. Hồng, the author of the source, explains that the character is written with 滛. His intent in the structural analysis is to show that the intended phonetic was 淫. So, the font is correct.

Potentially normalize the shape on the right to 淫 because as in the dictionary entries, 淫 is also a common form when used as a component.