Maggie-May stated herself, in the run-up to the GE, that Its purpose was to achieve a large majority in order to 'strengthen her hand in the forthcoming Brexit negotiations, to ensure the best possible deal for the nation'. (I paraphrase there, but it's an accurate representation of the gist of her utterances).

So how can the fact that she failed to achieve that 'large majority' and, in fact, failed to achieve a majority at all be a "total irrelevance to the BrexShit negotiations"?

That would infer that her pre-GE claim was a lie.