The LoadFixes Patch is no longer relevant for BT 1.9.1 as is actually slows down the loading process.
The ParseJson function actually has now the same try-catch logic as this patch and will only call StripHBSCommentsFromJSON() when needed.
In my testing I got an overall processing time of an unpatched StripHBSCommentsFromJSON() of 70ms, which is low enough to be ignored. (loading base game + loading a save file)
The function itself could be improved (using a instanced precompiled regex and a better regex itself), but considering the overall time wasted there is not worth it.