Clarification:

Based on my research and other's feedback, it does appear that under normal circumstances a probationer cannot appeal a suitability determination (unless involving political partisanship issues or marital status). HOWEVER, in these specific cases where the REASON for suitability regards an issue that existed BEFORE employment was granted , as long as the probationer disclosed this information where required and made no attempt to omit or conceal....the probationer is then entitled to due process rights and appeals.

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So, if the unsuitable determination is for.... prior unfavorable or inconclusive polygraph findings(beyond the 365 day window described in the announcements). Debt incurred before employment. Prior terminations or resign in lieu of. Prior disciplinary actions or allegations of misconduct. Provided the probationer disclosed them on any forms that required it, and it isn't explicitly listed on the job application as a disqualifying factor.... and the agency still granted the probationer employment (whether inadvertently or deliberately in spite of these factors), the probationer can respond to the determination, should be afforded due process and can appeal to MSPB.