Yes, it's not very clear that it's a 'p' at the beginning.
It's just an artefact of the speech synthesis. One of the other sentences 'Faint yw'r pecyn' has a much clearer 'p' sound.
I think you mean less aspirated - with less of a puff of air? No, the speech software here is wrong. It sounds more like becyn than pecyn.
In Welsh, unvoiced plosives (p, t, c) are aspirated like in most varieties of English, whereas the voiced plosives (b, d, g) are unaspirated and weakly voiced. Welsh b, d, g sound very similar to Romance (French, Spanish, Italian...) p, t, c.
And hence also sb and sg (though not sd strangely...), since there the b and the g are unaspirated.