Weird ports needed to be opened? It's just an app on the play store that opens when you tap it? What ports are we describing?
If you want to use the voice features, they rely on a range of ports to be open. In a corporate network, those are typically blocked; both TCP and UDP. Most home wifi and LTE/etc. are open, so they're never blocked. Yet Facetime, etc. all seem to function fine of HTTPS.
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I assume you are in the US. There is quite an advanced world outside your borders. The owner of your company is probably an intelligent fellow (note that he is the owner and you his employee). And as pointed out by
@Roadstar, WhatsApp is not Chinese. As you are undoubtedly aware, Facebook is American, as is Apple, so perhaps your fears should be facing towards home a bit more.
I'm not a Facebook guy, and couldn't care less about it or most Social Media platforms. WhatsApp had been notorious for exploits, most of which originated in China, so, bad on me for assuming. But when you open those things up to an enterprise, it's not too smart. So, yes he's a smart business man but that doesn't mean he's necessarily knowledgeable or smart about security. Any time you start opening ports, and/or a range of ports, you're also opening up the potential for exploits, etc. Like I said, that's up to him, his company. But if you ask most security folks who protect company assets, and IP they'll say it's a huge mistake.
Also, I'm not opposed to WhatsApp for chat, etc. in a personal setting. Every app out there has the chance for exploits, including Facetime, and others. I just prefer not to make exceptions on a corporate network, knowing they could/can cause vulnerabilities.