Yes, I think so! Except that in practice you will also hear soft in place of aspirate sometimes.
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Well hereās a funny thing. While looking for something else entirely, Iāve just come across this sentence on a website:
If the inflected verb begins with the first three of the nine [letters: p, t, c, d, b, g, m, ll, rh], then it takes an aspirate mutation. If it begins with the other six, then it takes a soft mutation.
Isnāt it funny how these things seem to crop up when youāre not really looking for them?
Diolch am eich help!
For negative sentences the āmissing particleā is na - which officially causes aspirate mutation where possible and soft mutation otherwise, but in the real world causes mainly soft mutation, though some people will use aspirate mutation on the C. If this all sounds too complicated, itās safe not to worry about it - even not mutating will be accepted without too many funny looks.
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Oh Iām used to funny looksā¦ I do most of my practice with my bemused colleagues here in Glastonbury. Mind you, few things are seen as odd in Glastonbury.
Iāve heard itās a bit like Llanidloes on steroids. Or maybe very strong herbal tea would be a better comparison. 
Yes it is - but only in the official language. SM is widely generalised in many spoken varieties, and particularly with P and T.
Dales i moār bil
I didnāt pay the bill
is common enough, despite the horror of the language police, and sounds less affected than
Thales i moār bil
Again, if you explicitly ask native speakers what they say, they will often tell you itās Thales iā¦, but then youāll hear them saying Dales iā¦ (or similar) among themselves later onā¦ 
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