I wrote to a company here in Australia “PUREAU” who claim to have the purest bottled water. They write back and said the systems they used and the way they were steam sterilised before each morning if filtration could not allow mycobacteria in. That is their claim. They told me to give them a batch number and they would send me an analysis of it. I did that but have not heard back from them as yet. However that is all that I am drinking atm and that is all I have been drinking for many years. I use it in my kettle too. Must say the kettle looks brand new inside.
As for pipes caked with biofilm?????? Would have to look into that. If your hot water is high enough it may destroy mycobacteria. I was told by the company that said run if someone tells you they can filter it out that the only thing that can destroy it is heat hot water set at 55 60 heat scalding temp.
I do believe that reverse osmosis under sink can filter NTM out as it’s installed at point of tap and can filter at 0.001 micron depending on filters used. Hope this helps in your decision.

I installed an Ultrafiltration system under my kitchen sink. The UF system filters down to 0.01 or 0.02 microns. I believe it was $189 plus $150 plumber cost to install. I purchased from Water cooler wholesale company and it's the Raintree UF Filter. I use it for cooking, washing fruits and vegetables, and drinking. There are 4 cartridges and should last 9-12 months for households of 1 or 2. I don't recall price for replacement cartridges but very reasonable and through a little tedious, I feel comfortable swapping out filters when needed. Videos online.
UF removes mycobacterium and the water tastes a lot better than RO.