Well, it depends a bit on how you think credsticks operate. And there are two sides to money laundering;
1) Concealing where the money goes to. This is pretty easy; just move it through various institutions that don't like to share information. Credsticks can be useful for this.
2) Explaining where your money came from. If a starving homeless SINner suddenly gets 100.000

on his account, the IRS will ask questions. This can be harder.
For step 1); this is how I interpret credsticks in my game:
A credstick is a small device sold by a financial instutition of some sort ("bank") licenced by the CC. It's linked to one bank account. It's huge data memory is mostly devoted to an extremely long one-time-pad (OTP) for which the bank has the counter-pad. This way, communication between credstick and bank is quite secure.
The only things the credstick can do is
A) give you your bank statement to tell you how much money remains in the account
B) wire money to another bank account
Communication with the bank is via OTP-encryption, and therefore unhackable. Every transmission is also unique, and duplicate instructions will cause a security alert.
The money all stays in the bank, not on the credstick. If the credstick is stolen or hacked, it can only be used to clean out that particular bank account. As long as the bank's security is good enough, the money is pretty safe.
Of course there are personalized credsticks which allow extra service, like credit. But these require SIN-checking. The basic function of a credstick is more like a kind of virtual wallet; it holds the key to paying from your bank account. This account can be anonymous.
So what are the applications to money laundering? You simply buy several anonymous credsticks from different banks and transfer money from 1 to 2 to 3 and so forth, making the trail difficult to follow without getting access to the transaction records of several (shady) banks.
What does the CC think of this? Mostly the CC doesn't want people "printing" money on their own and destabilizing the nuyen. So as long as all banks list how much money goes in, out, and remains in the bank, and those numbers add up, the CC is happy.