Same as on other platforms twitch ads are location based or in this case ip geo location. They are notoriously fighting ad blockers and have long been opting into ad stream injection which is why most common ad blocking techniques won't work. Basically after all the custom script solutions, like vaft script, started failing l started testing around with VPN taking advantage of the location based aspect of ads. Basically there are countries where noone is paying for running ads. E.g. Czech republic. So basically the most secure way to block ads on twitch is Vpn to certain countries. However I noticed that you need to use IPs from that country for about a day. It seems they are caching your Ip for some but after that you wont get any ads. You can read about all known ad solutioms of twitch here: https://github.com/pixeltris/TwitchAdSolutions

Also this does not work with the twitch mobile app and neither with the mobile version of twitch in a mobile browser. However it does work when switching to the desktop version in your mobile browser. So desktop version while using vpn on your phone should work. At least when I tested it last.