Clearly there is something wrong where a man can force his wife to drink bleach and only receive a suspended sentence.
HOWEVER, as someone upthread mentioned, this is reported in an incomplete way - the sentencing guidelines require an assessment of whether the person is "vulnerable" AS DEFINED IN THOSE GUIDELINES. The judge was not saying she was not vulnerable generally. Of course a woman who is being abused by her husband is vulnerable, regardless of her friendship group and university degrees.
He decided she didn't meet the definition of vulnerability as set out in the guidelines he was required to apply.
The guidelines and the law needs to change of course - of ocurse it is repugnant that this man got only a suspended sentence.
But you can't blame the judge - his remit is to apply the law and the sentencing guidelines as they currently stand.