There is no conflict.
Currently there is no evidence
means there is no evidence. It doesn't mean there is evidence against, it means that there is no evidence. They don't know of a person who has caught COVID-19 through food that was not exposed in some other way. The lack of evidence is suggestive that this isn't a major route of spread, though.
It may be possible that a person can get COVID-19 by touching a surface or object
means it may be possible. Evidence for this possibility might include swabbing surfaces and finding you can culture the virus from those swabs. There are other viruses (particularly those causing gastrointestinal illness, norovirus for example) that transmit often through a hand-to-mouth route. However, you're missing the end of the sentence in seeing a conflict:
this is not thought to be the main way the virus spreads.
In summary, there is no evidence (no known cases of spread) COVID-19 transmits through food, and although there is a hypothetical possibility it isn't thought to be particularly important from an epidemiological standpoint.