Antefalken did assure Tom that Lenamare would not be trying to summon him anytime soon. Remember he also had the stolen mana from Tiernon. That was during the cave period.
Once Tom had the Rod of Tommus, I’m pretty sure Lenamare was a lesser concern; if Lenamare tried again (remember Lenamare doesn’t know about the D’Orcs or Mount Doom, and even if/when he finds out, he won’t automatically assume Tom is in charge of Doom, unless Damien tells him) Tom would be able to use the Rod of Tommus and the Power of Doom to turn the tables.
At this point Tom pretty much is what Lenamare fears him to be.
And, in fact, my bet is that if Lenamare finds out that Tom has a D’Orc army, he will start doing whatever he can to sever the link or shield himself from Tom.
At the moment, Lenamare feels fairly safe because of the wards around the city, which are once more up.