How did Spinoza remain connected to some Jewish people after his excommunication?

Despite the formal excommunication (herem) issued against him in 1656, which strictly forbade members of the Amsterdam Jewish community from having any relationship with him, Benedict de Spinoza appears to have maintained contact with some members of the community.1

Evidence suggests that he continued to engage with Jewish individuals even after his exclusion. Specifically, in the late 1650s, Spinoza participated in a Jewish theological discussion group alongside other individuals, including a fellow excommunicant named Juan de Prado. While the herem was intended to isolate him completely, these interactions indicate that he remained connected to certain members of the community through shared intellectual and philosophical interests.1