The "issue" is that after receiving backlash for their public support of Trump, they publicly tried to state that it's not an issue because they also have people that support Biden... then the official company account is responding to pro-Trump posts on social media with heart eyes emojis.

It proves the original response they made trying to reduce the backlash from their political commentary, with subsequent reduction in sales and massive negative publicity, was only a platitude. They fucked around, found out, released a half-assed response to try and reduce the damage... and now apparently think it's been long enough that people forgot so they're publicly posting shit supporting Trump again. They're now being called out for the blatant lie to try to save the company.

Also, what is a “sticker mule”?

A company that sells things like custom stickers. One of many similar companies. They don't produce a unique product, it just happened to be a company that was a decent price, fast, and reliable. No issue until they themselves decided the right thing to do was to have the company wade into politics supporting a massively controversial person... for whatever stupid reason.

For further context, I recommend reading some articles about the original email. A few quick ones pulled from Google randomly since I know most people won't bother to search on their own, but may click a link provided.

https://www.forbes.com/sites/rebekahbastian/2024/07/19/sticker-mules-political-stance-undermines-workplace-inclusion-and-customer-trust/
https://www.cnbc.com/2024/07/18/sticker-mule-trump-2024-email-productive-discourse-expert.html
https://slate.com/business/2024/07/sticker-mule-ceos-pro-trump-maga-email-surprised-employees.html