You don’t need the event horizon, you just need local gravity around 1G. For the masses described in the article, that radius is from hundreds of meters to 10s of kilometers.
Which still wouldn't do what you suggest. The mass is the same, so it has the same effect from a distance. Unless by "eat earth" you meant it would take in dirt until it suck to the core, still about the same mass.
It will likely be a Greek or Roman name in keeping with tradition. The IAU generally let’s the person/group that discovers have an influence in the decision but they’re the final say on the name.
With two exceptions*, the names are from Roman mythology. So I’d expect the new planet to get a definitive name from the same template. (Please be Janus. It’s the gate of the solar system!)
*Uranus is from Greek mythology, with no good Latin equivalent. Terra is trickier; you could argue that it fits the template for Latin and the Romance languages, but most others simply use local words for soil, without a connection to the goddess. That is also called Tellus to add confusion.
Is this the one they’ve decided exists and then narrow down the parameters as what it must look like every time a survey rules out another patch of sky?
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