My favorite part from that article:

So that the assembled genome would be recognizable as synthetic, four of the ordered DNA sequences contained strings of bases that, in code, spell out an e-mail address, the names of many of the people involved in the project, and a few famous quotations.

I guess sooner or later the random mutations may make these string "corrupted".

I hope they included checkbits!

it may be a misconception but i think that checkbits are a feature of organic dna?

Yep! There is some error-checking built into dna-replication. The protein that does the replication is called DNA Polymerase. From its wikipedia article:

Error correction is a property of some, but not all, DNA polymerases. This process corrects mistakes in newly-synthesized DNA. When an incorrect base pair is recognized, DNA polymerase reverses its direction by one base pair of DNA. The 3'-5' exonuclease activity of the enzyme allows the incorrect base pair to be excised (this activity is known as proofreading). Following base excision, the polymerase can re-insert the correct base and replication can continue.