Yes, but that is still consistent with the statement, “he may not for that reason delay absolution without the free consent of the penitent”
If the penitent freely consents not to seek absolution at that time, Canon 980 appears to no longer apply.
CCEO (eastern Canon Law) has a excellent definition of the sacrament of penance:
Canon 718
In the sacrament of penance, the Christian faithful who committed sins after baptism, internally led by the Holy Spirit, turn back to God, moved by the pain of sin, intent on entering a new life through the ministry of the priest, having themselves made a confession and accepted an appropriate penance, obtain forgiveness from God and at the same time are reconciled with the Church which they injured by sinning; by this sacrament they are brought to a greater fostering of the Christian life and are thus disposed for receiving the Divine Eucharist.
So if the person does not seek absolution, then no absolution occurs because there is no intention to receive it.
Can. 980 If the confessor has no doubt about the disposition of the penitent, and the penitent seeks absolution, absolution is to be neither refused nor deferred.
Can. 843 §1. Sacred ministers cannot deny the sacraments to those who seek them at appropriate times, are properly disposed, and are not prohibited by law from receiving them.
Can. 982 Whoever confesses to have denounced falsely an innocent confessor to ecclesiastical authority concerning the crime of solicitation to sin against the sixth commandment of the Decalogue is not to be absolved unless the person has first formally retracted the false denunciation and is prepared to repair damages if there are any.
The priest, can’t absolve except per canon law. Eastern Catholic canon law has reserved sins, but even though the Latin does not, the priest can refuse absolution when there is “positive and serious doubt" which could be known if lacking these:
- sorrow for sin
- a firm purpose of amendment,
- self-accusation before a confessor, (by self or interpreter)
- acceptance of a lawful penance
See CIC 987 for actual reception of the sacrament.
If the one confessing lies about these to receive absolution, the absolution may be given, not no grace would be received.
But the failure to perform a penance does not invalidate it, but the Baltimore Catechism shows that confession will not be valid without contrition, (even it absolution is given):
Q. 782. What should one do who has only venial sins to confess?
A. One who has only venial sins to confess should tell also some sin already confessed in his past life for which he knows he is truly sorry; because it is not easy to be truly sorry for slight sins and imperfections, and yet we must be sorry for the sins confessed that our confession may be valid – hence we add some past sin for which we are truly sorry to those for which we may not be sufficiently sorry.