No, not really. The martian atmosphere was mainly taken away by the solar wind because the magnetic field disappeared.
I would not say that scientists are tight lipped about water on Mars. Every "martian" scientist hopes to show real evidence of flowing water on Mars. And lately the radar data showing the huge ice deposits at the pole of Mars. Guess you had your ears and eyes closed when this was brought to the public. The link you put in your message is from 2004!! Lots of things have happened since then. And scientist cannot just blabber out somthing at the first sign that something may be there, they have to have good evidence, otherwise they will get ridiculed by their colleagues (and rightly so).

Just another unfounded ATM/conspirace theme going on here.

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善數, 不用籌策 (shàn shù, bù yòng chóu cè)
He who is good at counting, uses no counting tools
“A good scientist has freed himself of concepts and keeps his mind open to what is”
道德經, 二十七 (dào dé jīng, 27)