Sure it is, depending on the analogy and the purpose of the analogy. An analogy also isn't always fallacious. It needs to have a faulty extrapolated assumption from the comparison.

In this particular case, the argument is that C should be replaced with something safer for similar reasons that asbestos is replaced with something safer. However, one can certainly challenge the validity of this comparison and whether there's something faulty in it.

I don't feel one way or the other because I don't work with C or other low-level languages, but it's a bit absurd to say that an analogy isn't an argument. It absolutely can be if the argument within is clear, even if fallacious.