These meteorites contain all of the building blocks of DNA

Yes indeed! The crucial points are that:

1) Natural selection cannot plausibly operate before any life arrived on the earth.

2) Instructions encoded on DNA consist of long chains of symbols (nucleotides) which need to be just about perfect to be of any use. This implies that the relevant DNA evolves in stages, one mutation at a time. Since most of the intermediate steps confer no individual fitness to the organism, combinatorial calculations rule.

3) I'd love to read how StephenW escapes the above, without using a lot of undefined terms such as 'informational'.

Even preceding this, there is the matter of the origin of the DNA structure and coding scheme themselves.