Cette erreur a failli paralyser le réseau irréversiblement, je le sais.

From Lesson 371:Near misses (faillir)·French

Questions & Answers about Cette erreur a failli paralyser le réseau irréversiblement, je le sais.

Why use a failli paralyser instead of using the word presque?
While both can mean 'almost', using the verb faillir followed directly by an infinitive (here, paralyser) is the most natural and idiomatic way in French to express a 'near miss'—an event that almost happened but ultimately did not. Notice that faillir acts as an auxiliary here and is conjugated in the passé composé (a failli), while the main action stays in the infinitive.
Can I use faillir in the present tense to say I am 'almost' doing something?
No, when it carries the meaning of 'to almost do something', faillir is used almost exclusively in the passé composé (as in a failli here) or other past tenses. It specifically describes an action that was on the verge of happening in the past but didn't.
In je le sais, what does the le refer to, and do I really need it?
The le is a neutral pronoun referring back to the entire preceding idea: the fact that the error almost paralyzed the network. While English speakers often just say 'I know', French strongly prefers verbs like savoir to have a stated direct object. Saying just je sais in this context would sound quite unnatural to a French ear.
Why is the adverb irréversiblement placed at the very end of the first clause?
In French, adverbs generally cannot separate a verb from its direct object. The direct object of the infinitive verb paralyser is le réseau (the network). Because they must stay together, the long adverb irréversiblement is pushed to the end of the phrase.

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