Only if one interprets an apology as a meaningful change of behaviour.

Depending on context, one might, I’d think that would be reserved for matters of simple human error, and even then I think one would still wish to see measures to prevent similar in future.

Hosing down a homeless person doesn’t fall into that category, being intentionally awful, and likely emerging from abusive or highly neglectful management practices. For things like this, one would be seeking changes which go to addressing the core of the offence.

In reality it is hard to assess whether reforms have been implemented, especially with huge multinationals that can deploy heavy PR campaigns, but I don’t know that anyone is going to cry if a boycott persists somewhat longer than is necessary.