The same article quotes a T source confirming that Springfield has enough China-delivered shells and parts onhand to continue the production line and deliveries for at least the rest of the year (longer than that, in fact, given that the article also says that there are at least 22 Red cars in active production at Springfield right now). So while these component shipping delays are no doubt a problem if not resolved soon enough, they're very much a future-tense problem when it comes to outright stopping the order. Breathe, please.
EDIT: Doing some math, NETransit is showing 38 Red cars in-service, with 10 unaccepteds delivered and in-testing. To go along with the at least 22 confirmed in-assembly in Springfield, so there's likely no way the order could stop before we hit 70 cars. There are only 4 01600 cars left in-service, and 22 01500's, so we only have to hit about 64-66 total CRRC cars before those antiques are completely gone. Getting the entire 1969-70 #1 fleet retired is a big milestone, because those are far and away the most decrepit cars on the whole system and the ones that are failing all the freaking time out there. The #2/01700 series was rebuilt in the last 9 years and are holding up well, and the #3/01800 series while 31 years old without a rebuild are so far not failing at too abnormally high a rate. There'd obviously be concern if the contract were hit with any major delay once the shipped components supply ran dry, but it probably wouldn't be catastrophic because we'd have succeeded at getting the most-dire concern #1 cars completely expunged before any supply-chain interruptions start affecting deliveries.
And they have time to troubleshoot this before there's an actual impact on the assembly line, so the shipping delays are not close to impacting Springfield.