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good question.
Where is this "capacitor bank"? (We don´t see your schematic) In the tuning circuit?
* Yes: Then it is for tuning.
* No: Then it is not for tuning.
use the same document, read the next few lines and have a look at Figure 8 Voltage Controlled Oscillator (VCO) output frequency as a function of the capacitor bank
control word
PDF | A novel varactor circuit exhibiting a wider tuning range and a new technique for quadrature coupling of LC-Voltage Controlled Oscillator (LC-VCO)... | Find, read and cite all the research you need on ResearchGate
Coarse Tuning and Calibration.Every RFIC circuit has process variations and in order to compensate these process variations, a calibartion routine runs while initializing to maintain the VCO standard.
inductors are hard to fabricate in ICs.
Capacitors are easy to fabricate, and you can change their total capacitance by adding a varactor diode, or switching in other fixed capacitor values
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