9 times out of 10 the 'rattle' is misdiagnosed as a loose timing chain or failing chain tensioner.
On this engine it is almost never the chain or tensioner that makes this noise - the noise on startup is the camshaft adjuster sticking, which admittedly sounds like a rattling timing chain to in the untrained ear.
The problem effects engines from 2009 to mid 2010. After that the camshaft adjuster was revised to stop this problem.
Some people who have had the timing chain replaced, also had the adjuster replaced at the same time and this inadvertently resolved the problem.
Only a poor dealership would not replace the adjuster at the same time.
Since 2015 there are 2 official VW universal timing chain kits for all 1.2, 1.4 and 1.6 FSI/TSI engines, which come with a new camshaft adjuster - this kit is cheaper than buying the chain, tensioner and parts separately. This kit should be used for any timing chain job, as its cheaper and you get all new sprockets, guides, tensioner, chain and camshaft adjuster (latest version).
Check out a post I made here (froudeg) to diagnose what sound is what:
Scirocco Central • View topic - Sounds like a tractor on start up?
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