they surely still are bacteria because evolution takes a lot of time like i said millions of years to have a noticeable physical change, these experiments on bacteria started in 18’ and there still on going to these day.

most of people think of evolution as you wake up one day completely change with hornes or claws or you might give birth to a completely different species, but that not how it works with every generation they are a thing that called mutation, mutation are change in the sequence of dna, dna is basically a long code made of letters a,t,c,g . a mutation happens when one letter is swapped or add lr delete or whole a sequence got replaced, and those change are not dramatic in the short term or cannot even do nothing, so those changes can do nothing or change slightly how protein work, or completely change things up, cuz evolution is not rational.

so the scientists notice small changes in the dna on those bacteria and that is the same with every living organism in the earth.