Nothing in the article supports that.

Also, nothing in the article specifies if the production capacity in Russia is from running the same factories longer or adding new factories. The former could increase defective munitions being produced and the later would probably show about the same level of defectives as production at lower rates.

Also, artillery shells and their fuses are two different things. Nothing in the article says anything about the fuse production, it might be assumed in the article and I'm just being pedantic, or it might an intentional oversight. Pretty sure its the fuses that are normally the problem when an artillery shell doesn't explode when its supposed to.