As a secret schizoid, I’m confident I can declare myself as such without my secret being revealed :)
It’s an interesting cluster of characteristics:
>The ‘secret schizoid’
Many schizoid individuals display an engaging, interactive personality contradicting the observable characteristic emphasized by the DSM-5 and ICD-10 definitions of the schizoid personality. Guntrip (using ideas of Klein, Fairbairn, and Winnicott) classifies these individuals as “secret schizoids”, who behave with socially available, interested, engaged, and involved interaction yet remain emotionally withdrawn and sequestered within the safety of the internal world.:p. 17
Frequently, a schizoid individual’s social functioning improves, sometimes dramatically, when the individual knows he or she is an anonymous participant in a real-time conversation or correspondence, e.g. in an online chat-room or message-board. Indeed, it is often the case the individual’s online correspondent will report nothing amiss in the individual’s engagement and affect.
Withdrawal or detachment from the outer world is a characteristic feature of schizoid pathology, but may appear either in “classic” or in “secret” form. When classic, it matches the typical description of the schizoid personality offered in the DSM-5. It is “just as often” a hidden internal state: that which meets the objective eye may not match the subjective, internal world of the patient. Klein cautions one should not miss identifying the schizoid person because one cannot see the person’s withdrawal through the patient’s defensive, compensatory interaction with external reality. He suggests one ask the person what his or her subjective experience is, to detect the presence of the schizoid refusal of emotional intimacy.
Descriptions of the schizoid personality as “hidden” behind an outward appearance of emotional engagement have been recognized since 1940 with Fairbairn’s description of “schizoid exhibitionism,” in which the schizoid individual is able to express a great deal of feeling and to make what appear to be impressive social contacts yet in reality gives nothing and loses nothing. Because he or she is “playing a part,” his or her personality is not involved. According to Fairbairn, the person disowns the part he is playing and the schizoid individual seeks to preserve his personality intact and immune from compromise. Further references to the secret schizoid come from Masud Khan, Jeffrey Seinfeld, and Philip Manfield, who give a description of an SPD individual who “enjoys” public speaking engagements but experiences great difficulty in the breaks when audience members would attempt to engage him emotionally. These references expose the problems in relying on outer observable behavior for assessing the presence of personality disorders in certain individuals.
https://en.wikipedia.org/wiki/Schizoid_personality_disorder#The_’secret_schizoid’

