The text specifically teaches congregational Witr in Ramadan.
A juristic preference is also recorded:
• Qadi Khan preferred Ramadan Witr with the congregation over delaying it to the end of the night alone;
• other Hanafi authorities authenticated the opposite preference.
The course therefore records the disagreement instead of presenting one preference as if no Hanafi alternative exists.
Outside Ramadan, do not turn this sentence into a blanket claim that every small, non-publicly arranged Witr congregation is automatically invalid; that is a separate juristic detail.