Thank you Constentin for you input!
However modifying base value did nothing, tried many other values to no success.
What did work may not be most "elegant" solution, but I modified the type of effect from disable spellcasting to modify resolve, and since base value is by default zero the effect does nothing, so my character can spell cast.
{ "GameDataObjects": [
{
"$type": "Game.GameData.StatusEffectGameData, Assembly-CSharp",
"DebugName": "Form_Of_The_Fearsome_Brute_SE_DisableSpells",
"ID": "62f385fb-60ab-4b25-97af-c89645500616",
"Components": [{
"$type": "Game.GameData.StatusEffectComponent, Assembly-CSharp",
"StatusEffectType":"Resolve"
}]
},
I guess is someone has better solution, they can always share it.