lol i hear Adam, no long M... as a matter of fact, both "a" are very short too, the way I would say it as a native speaker and how it's said in the "how to say" video I have shared earlier... but you know.. that is probably just me being old and deaf.
ETA in French, often the final consonant is silent. Like in Thomas, you won't hear the S like you would in English MASS but it will be MA.
With the AM combo, it turns the A into a nasal vowel which doesn't quite exist in English. Richaud says it that way and not in some other version which would give A- DAMmmm with a long wet M and no nasal.. It's very short vowels, the first A being a clear and pure A sound and the second the AM is transformed into a AN sound, close, short and dry nasal.
here in case you need it again
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PS I work with singers a lot and diction is one of my things so.. sorry for being so detailed about this.