Can you say "they are evolving"?
E-V-O-L-U-T-I-O-N.
Their DNA is a combination of the DNA from multiple ancestor bacteria. The DNA has recombined, it has mutated, it has diverged and been selected for and it has evolved.
They sequence these genomes. It's on paper. It is irrefutable. It follows common sense. It is scientific. It is fact. It is evolution.
Who was arguing otherwise?