If they do get that drug and it works as advertised the FDA will probably deny it certification. Regulatory bureaus always end up being run by people from the industries being regulated because those are the experts and the ones who are interested. They are also loyal to their industries and the Medical industry is interested in managing disease, especially diseases treated with lucrative medicines and procedures. They would not like to see the advent of a drug that simply cures things. There is no profit in it and it would cut out a whole treatment industry.
Peptides can be viewed as protein fragments. Many products already avail themselves the use of peptides.
Bacteria probably can be used to cleave a source of specific proteins to produce the specific fragments. Might be easy to bootleg production. Only a bit over 100 specific peptides mentioned as needed to cover the gamut of possible cancers.
Diagnosis of the specific cancer type may be the most pressing issue in treatment, the proper combination of peptides being essential for success.