No, generating waste heat that is dumped to the environment is a hallmark of life. All life is a process of organization, maintaining or decreasing the entropy of the organism. The fundamental reason that all life must generate waste heat is to satisfy the Second Law, that entropy increases overall.
It may be true that in a temporary dormant state (spores, seeds) there is no heat generated because no maintenance is required. But anything growing or moving is always generating waste heat.
Glass is transparent to near-infrared, just outside the visible spectrum, but glass is opaque to middle and long wavelength infrared. ‘Thermal’ infrared is in the middle wavelength range, so doesn’t pass through glass.
Both effect are at play … traditionally The Walrus is more correct as the glass prevents convection … but today’s new fangled technologies bring us the kinds of glass brossa is speaking of …