Yes the processor is still strong but it's weaker than smartphones. Yes you can still sneak data past home networks but it's harder than 3rd party networks. Yes they can be more overlooked, but they still have access to less data than smartphones.
None of the points you make prove that home speakers are as bad or worse than smartphones. The original comment wasn't arguing that smart speakers are safe, they were just pointing out the hypocrisy over owning a smartphone and being against smart speakers.